自定义View实现阶梯梯形布局以及二维码的实现
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2022-03-20 11:41:21
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一.要求
实现如图所示效果，标题栏通过组合View的方式进行实现，统一对外暴露左侧按钮和右侧按钮点击的方法，在点击右侧的回调方法中跳转到图二所示页面，图二的页面标题栏显示上一个页面组合View的视图，通过自定义ViewGroup的方式实现梯形布局（下一个视图的起始位置是上一个视图的结束位置）。图一中间的进度条使用继承自View的方式进行实现，并使用自定义属性的方式来设置进度条中间的颜色。点击扫描二维码按钮之后，进度条开始以每秒10%的进度进行，当进度条走到100%后，跳转到图三的扫描二维码页面，实现扫描二维码的功能
二.代码实现
1.标题栏
package com.example.zhouyf.zhoukao1;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
/**
* Created by Zhouyf on 2017/11/4.
*/
public class TitleViewActivity extends LinearLayout {
// private OnAddDelClickListener listener;
private ImageView img_left;
private ImageView img_right;
//
// interface OnAddDelClickListener {
// void onBackView(View v);
// void onGroupView(View v);
// }
// public void setOnAddDelClickListener(OnAddDelClickListener listener){
// if (listener!=null){
// this.listener = listener;
// }
// }
public TitleViewActivity(Context context) {
this(context,null);
}
public TitleViewActivity(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public TitleViewActivity(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context, attrs, defStyleAttr);
}
private void initView(Context context, AttributeSet attrs, int defStyleAttr) {
View v = inflate(context, R.layout.title, this);
img_left = (ImageView) v.findViewById(R.id.title_back);
img_right = (ImageView) v.findViewById(R.id.title_right);
TextView txt_title = (TextView) v.findViewById(R.id.title_center);
// img_left.setOnClickListener(new OnClickListener() {
// @Override
// public void onClick(View v) {
// listener.onBackView(v);
// }
// });
}
public void setLeftClick(OnClickListener lister){
img_left.setOnClickListener(lister) ;
}
public void setRightClick(OnClickListener lister){
img_right.setOnClickListener(lister);
}
}
package com.example.zhouyf.zhoukao1;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity{
private final int UPDATE_PROGRESS = 001;
private static final int FLAG = 0x123;
Handler myHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
// switch (msg.what){
// case 001:
// int progress =(int) msg.obj;
// pb.setProgress(progress);
// if (progress==100){
// Intent intent = new Intent(MainActivity.this,ZxingActivity.class);
// startActivity(intent);
// progress=0;
// }
// break;
// }
switch (msg.what) {
case FLAG:
int progress = pb.getProgress();
progress += 10;
if (progress > 100) {
progress = 0;
Intent intent = new Intent(MainActivity.this,ZxingActivity.class);
startActivity(intent);
}
pb.setProgress(progress);
myHandler.sendEmptyMessageDelayed(FLAG, 1000);
break;
}
}
};
private RoundProgressBar pb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TitleViewActivity tva = (TitleViewActivity) findViewById(R.id.title);
pb = (RoundProgressBar) findViewById(R.id.roundProgressBar2);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(){
public void run(){
// for (int i=0;i<100;i++){
// Message msg = myHandler.obtainMessage();
// msg.what = UPDATE_PROGRESS;
// msg.obj = i+10;
// myHandler.sendMessage(msg);
// try {
// Thread.sleep(100);//休眠100ms
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
// }
myHandler.sendEmptyMessageDelayed(FLAG, 1000);
}
}.start();
}
});
tva.setLeftClick(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
tva.setRightClick(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,GroupActivity.class);
startActivity(intent);
}
});
}
@Override
protected void onStop() {
super.onStop();
myHandler.removeMessages(FLAG);
}
}
package com.example.zhouyf.zhoukao1;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class GroupActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_view_group);
TitleViewActivity group_tva = (TitleViewActivity) findViewById(R.id.g_title);
group_tva.setLeftClick(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}
package com.example.zhouyf.zhoukao1;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Zhouyf on 2017/11/4.
*/
public class MyViewGroup extends ViewGroup {
public MyViewGroup(Context context) {
super(context);
}
public MyViewGroup(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureChildren(widthMeasureSpec,heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int count = getChildCount();
int startWidth = 0;
int startHeight = 0;
for (int i=0; i<count; i++){
View v = getChildAt(i);
v.layout(startWidth,startHeight,startWidth+v.getMeasuredWidth(),startHeight+v.getMeasuredHeight());
startWidth += v.getMeasuredWidth();
startHeight += v.getMeasuredHeight();
}
}
}
package com.example.zhouyf.zhoukao1;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;
import com.google.zxing.client.android.camera.CameraManager;
/**
* Created by Zhouyf on 2017/11/4.
*/
public class AutoScannerView extends View {
private static final String TAG = AutoScannerView.class.getSimpleName();
private Paint maskPaint;
private Paint linePaint;
private Paint traAnglePaint;
private Paint textPaint;
private CameraManager cameraManager;
private final int maskColor = Color.parseColor("#60000000"); //蒙在摄像头上面区域的半透明颜色
private final int triAngleColor = Color.parseColor("#76EE00"); //边角的颜色
private final int lineColor = Color.parseColor("#FF0000"); //中间线的颜色
private final int textColor = Color.parseColor("#CCCCCC"); //文字的颜色
private final int triAngleLength = dp2px(20); //每个角的点距离
private final int triAngleWidth = dp2px(4); //每个角的点宽度
private final int textMarinTop = dp2px(30); //文字距离识别框的距离
private int lineOffsetCount = 0;
public AutoScannerView(Context context, AttributeSet attrs) {
super(context, attrs);
maskPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
maskPaint.setColor(maskColor);
traAnglePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
traAnglePaint.setColor(triAngleColor);
traAnglePaint.setStrokeWidth(triAngleWidth);
traAnglePaint.setStyle(Paint.Style.STROKE);
linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
linePaint.setColor(lineColor);
textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
textPaint.setColor(textColor);
textPaint.setTextSize(dp2px(14));
}
public void setCameraManager(CameraManager cameraManager) {
this.cameraManager = cameraManager;
invalidate();//重新进入可能不刷新，所以调用一次。
}
@Override
protected void onDraw(Canvas canvas) {
if (cameraManager == null)
return;
Rect frame = cameraManager.getFramingRect();
Rect previewFrame = cameraManager.getFramingRectInPreview();
if (frame == null || previewFrame == null) {
return;
}
int width = canvas.getWidth();
int height = canvas.getHeight();
// 除了中间的识别区域，其他区域都将蒙上一层半透明的图层
canvas.drawRect(0, 0, width, frame.top, maskPaint);
canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, maskPaint);
canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, maskPaint);
canvas.drawRect(0, frame.bottom + 1, width, height, maskPaint);
String text = "将二维码放入框内，即可自动扫描";
canvas.drawText(text, (width - textPaint.measureText(text)) / 2, frame.bottom + textMarinTop, textPaint);
// 四个角落的三角
Path leftTopPath = new Path();
leftTopPath.moveTo(frame.left + triAngleLength, frame.top + triAngleWidth / 2);
leftTopPath.lineTo(frame.left + triAngleWidth / 2, frame.top + triAngleWidth / 2);
leftTopPath.lineTo(frame.left + triAngleWidth / 2, frame.top + triAngleLength);
canvas.drawPath(leftTopPath, traAnglePaint);
Path rightTopPath = new Path();
rightTopPath.moveTo(frame.right - triAngleLength, frame.top + triAngleWidth / 2);
rightTopPath.lineTo(frame.right - triAngleWidth / 2, frame.top + triAngleWidth / 2);
rightTopPath.lineTo(frame.right - triAngleWidth / 2, frame.top + triAngleLength);
canvas.drawPath(rightTopPath, traAnglePaint);
Path leftBottomPath = new Path();
leftBottomPath.moveTo(frame.left + triAngleWidth / 2, frame.bottom - triAngleLength);
leftBottomPath.lineTo(frame.left + triAngleWidth / 2, frame.bottom - triAngleWidth / 2);
leftBottomPath.lineTo(frame.left + triAngleLength, frame.bottom - triAngleWidth / 2);
canvas.drawPath(leftBottomPath, traAnglePaint);
Path rightBottomPath = new Path();
rightBottomPath.moveTo(frame.right - triAngleLength, frame.bottom - triAngleWidth / 2);
rightBottomPath.lineTo(frame.right - triAngleWidth / 2, frame.bottom - triAngleWidth / 2);
rightBottomPath.lineTo(frame.right - triAngleWidth / 2, frame.bottom - triAngleLength);
canvas.drawPath(rightBottomPath, traAnglePaint);
//循环划线，从上到下
if (lineOffsetCount > frame.bottom - frame.top - dp2px(10)) {
lineOffsetCount = 0;
} else {
lineOffsetCount = lineOffsetCount + 6;
// canvas.drawLine(frame.left, frame.top + lineOffsetCount, frame.right, frame.top + lineOffsetCount, linePaint); //画一条红色的线
Rect lineRect = new Rect();
lineRect.left = frame.left;
lineRect.top = frame.top + lineOffsetCount;
lineRect.right = frame.right;
lineRect.bottom = frame.top + dp2px(10) + lineOffsetCount;
canvas.drawBitmap(((BitmapDrawable)(getResources().getDrawable(R.drawable.scanline))).getBitmap(), null, lineRect, linePaint);
}
postInvalidateDelayed(10L, frame.left, frame.top, frame.right, frame.bottom);
}
private int dp2px(int dp) {
float density = getContext().getResources().getDisplayMetrics().density;
return (int) (dp * density + 0.5f);
}
}
6.二维码的主activity
package com.example.zhouyf.zhoukao1;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.SurfaceView;
import android.widget.Toast;
import com.google.zxing.Result;
import com.google.zxing.client.android.BaseCaptureActivity;
public class ZxingActivity extends BaseCaptureActivity {
private static final String TAG = ZxingActivity.class.getSimpleName();
private SurfaceView surfaceView;
private AutoScannerView autoScannerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zxing);
surfaceView = (SurfaceView) findViewById(R.id.preview_view);
autoScannerView = (AutoScannerView) findViewById(R.id.autoscanner_view);
}
@Override
protected void onResume() {
super.onResume();
autoScannerView.setCameraManager(cameraManager);
}
@Override
public SurfaceView getSurfaceView() {
return (surfaceView == null) ? (SurfaceView) findViewById(R.id.preview_view) : surfaceView;
}
@Override
public void dealDecode(Result rawResult, Bitmap barcode, float scaleFactor) {
playBeepSoundAndVibrate(true, false);
Toast.makeText(this, rawResult.getText(), Toast.LENGTH_LONG).show();
// 对此次扫描结果不满意可以调用
// reScan();
}
}
7.圆形进度条
package com.example.zhouyf.zhoukao1;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;
/**
* Created by Zhouyf on 2017/11/4.
*/
public class RoundProgressBar extends View {
/**
* 画笔对象的引用
*/
private Paint paint;
/**
* 圆环的颜色
*/
private int roundColor;
/**
* 圆环进度的颜色
*/
private int roundProgressColor;
/**
* 中间进度百分比的字符串的颜色
*/
private int textColor;
/**
* 中间进度百分比的字符串的字体
*/
private float textSize;
/**
* 圆环的宽度
*/
private float roundWidth;
/**
* 最大进度
*/
private int max;
/**
* 当前进度
*/
private int progress;
/**
* 是否显示中间的进度
*/
private boolean textIsDisplayable;
/**
* 进度的风格，实心或者空心
*/
private int style;
public static final int STROKE = 0;
public static final int FILL = 1;
public RoundProgressBar(Context context) {
this(context, null);
}
public RoundProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
super(context,attrs,defStyle);
paint = new Paint();
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.RoundProgressBar);
//获取自定义属性和默认值
roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
mTypedArray.recycle();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 画最外层的大圆环
*/
int centre = getWidth()/2; //获取圆心的x坐标
int radius = (int) (centre - roundWidth/2); //圆环的半径
paint.setColor(roundColor); //设置圆环的颜色
paint.setStyle(Paint.Style.STROKE); //设置空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setAntiAlias(true); //消除锯齿
canvas.drawCircle(centre, centre, radius, paint); //画出圆环
/**
* 画进度百分比
*/
paint.setStrokeWidth(0);
paint.setColor(textColor);
paint.setTextSize(textSize);
paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体
int percent = (int)(((float)progress / (float)max) * 100); //中间的进度百分比，先转换成float在进行除法运算，不然都为0
float textWidth = paint.measureText(percent + "%"); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间
if(textIsDisplayable && percent != 0 && style == STROKE){
canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比
}
/**
* 画圆弧 ，画圆环的进度
*/
//设置进度是实心还是空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setColor(roundProgressColor); //设置进度的颜色
RectF oval = new RectF(centre - radius, centre - radius, centre
+ radius, centre + radius); //用于定义的圆弧的形状和大小的界限
switch (style) {
case STROKE:{
paint.setStyle(Paint.Style.STROKE);
canvas.drawArc(oval, 0, 360 * progress / max, false, paint); //根据进度画圆弧
break;
}
case FILL:{
paint.setStyle(Paint.Style.FILL_AND_STROKE);
if(progress !=0)
canvas.drawArc(oval, 0, 360 * progress / max, true, paint); //根据进度画圆弧
break;
}
}
}
public synchronized int getMax() {
return max;
}
/**
* 设置进度的最大值
* @param max
*/
public synchronized void setMax(int max) {
if(max < 0){
throw new IllegalArgumentException("max not less than 0");
}
this.max = max;
}
/**
* 获取进度.需要同步
* @return
*/
public synchronized int getProgress() {
return progress;
}
/**
* 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
* 刷新界面调用postInvalidate()能在非UI线程刷新
* @param progress
*/
public synchronized void setProgress(int progress) {
if(progress < 0){
throw new IllegalArgumentException("progress not less than 0");
}
if(progress > max){
progress = max;
}
if(progress <= max){
this.progress = progress;
postInvalidate();
}
}
public int getCricleColor() {
return roundColor;
}
public void setCricleColor(int cricleColor) {
this.roundColor = cricleColor;
}
public int getCricleProgressColor() {
return roundProgressColor;
}
public void setCricleProgressColor(int cricleProgressColor) {
this.roundProgressColor = cricleProgressColor;
}
public int getTextColor() {
return textColor;
}
public void setTextColor(int textColor) {
this.textColor = textColor;
}
public float getTextSize() {
return textSize;
}
public void setTextSize(float textSize) {
this.textSize = textSize;
}
public float getRoundWidth() {
return roundWidth;
}
public void setRoundWidth(float roundWidth) {
this.roundWidth = roundWidth;
}
}
1.mainactivity对应的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android_custom="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.zhouyf.zhoukao1.MainActivity">
<!--标题设置-->
<com.example.zhouyf.zhoukao1.TitleViewActivity
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/title"
>
</com.example.zhouyf.zhoukao1.TitleViewActivity>
<!--圆形进度条-->
<com.example.zhouyf.zhoukao1.RoundProgressBar
android:id="@+id/roundProgressBar2"
android:layout_width="180dp"
android:layout_height="180dp"
android:layout_centerInParent="true"
android_custom:roundColor="#D1D1D1"
android_custom:roundProgressColor="#00fe00"
android_custom:textColor="#888888"
android_custom:textIsDisplayable="true"
android_custom:roundWidth="10dip"
android_custom:textSize="18sp" >
</com.example.zhouyf.zhoukao1.RoundProgressBar>
<Button
android:layout_width="300dp"
android:layout_height="wrap_content"
android:text="扫描二维码"
android:gravity="center"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:background="#619f68"
android:textColor="#9f4258"
android:layout_below="@+id/roundProgressBar2"
android:id="@+id/btn"/>
</RelativeLayout>
2.二维码对应的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.zhouyf.zhoukao1.ZxingActivity">
<SurfaceView
android:id="@+id/preview_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<com.example.zhouyf.zhoukao1.AutoScannerView
android:id="@+id/autoscanner_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
3.标题布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#d4dbed"
android:padding="5dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="30dp"
android:src="@drawable/left"
android:layout_weight="1"
android:id="@+id/title_back"
/>
<TextView
android:layout_width="500dp"
android:layout_height="wrap_content"
android:text="那些花儿"
android:textSize="26dp"
android:gravity="center"
android:layout_weight="1"
android:id="@+id/title_center"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="30dp"
android:src="@drawable/shenfen"
android:layout_weight="1"
android:id="@+id/title_right"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.zhouyf.zhoukao1.GroupActivity">
<com.example.zhouyf.zhoukao1.TitleViewActivity
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/g_title">
</com.example.zhouyf.zhoukao1.TitleViewActivity>
<com.example.zhouyf.zhoukao1.MyViewGroup
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="127dp"
android:layout_height="50dp"
android:background="#619ea0" />
<TextView
android:layout_width="127dp"
android:layout_height="50dp"
android:background="#7561a0"/>
<TextView
android:layout_width="127dp"
android:layout_height="50dp"
android:background="#9fa061" />
</com.example.zhouyf.zhoukao1.MyViewGroup>
</LinearLayout>
实现二维码时需要
1.通过new import moudle引入 zxinglite这个文件夹
2.需要在项目清单文件中设置
<uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.VIBRATE" /> <uses-permission android:name="android.permission.FLASHLIGHT" />