Android 实现加载动画

首先在drawable下建一个anim_loading.xml,代码如下：

<?xml version="1.0" encoding="utf-8"?>
<animation-list
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false">

    <item android:duration="130" android:drawable="@drawable/image_loading_01"></item>
    <item android:duration="130" android:drawable="@drawable/image_loading_02"></item>
    <item android:duration="130" android:drawable="@drawable/image_loading_03"></item>
    <item android:duration="130" android:drawable="@drawable/image_loading_04"></item>
    <item android:duration="130" android:drawable="@drawable/image_loading_05"></item>
    <item android:duration="130" android:drawable="@drawable/image_loading_06"></item>

</animation-list>

在layout文件下建一个layout_dialog.xml,代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/aa_dialog_bg"
    android:gravity="center"
    android:padding="10dp"
    android:orientation="vertical">

    <ProgressBar
        android:id="@+id/loading_progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5.0dip"
        android:indeterminateDrawable="@drawable/animation_loading" />

    <TextView
        android:id="@+id/tv_reminder"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="12sp"
        android:text="加载中..."
        android:textColor="@color/colorTextGray" />

</LinearLayout>

实现dialog的调用：

package youhua.com.mytestapp;

import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;


/**
 * description:弹窗浮动加载进度条
 */
public class LoadingDialog {
    /** 加载数据对话框 */
    private static Dialog mLoadingDialog;
    /**
     * 显示加载对话框
     * @param context 上下文
     * @param msg 对话框显示内容
     * @param cancelable 对话框是否可以取消
     */
    public static Dialog showDialogForLoading(Activity context, String msg, boolean cancelable) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_dialog, null);
        TextView loadingText = (TextView)view.findViewById(R.id.tv_reminder);
        loadingText.setText(msg);

        mLoadingDialog = new Dialog(context, R.style.CustomProgressDialog);
        mLoadingDialog.setCancelable(cancelable);
        mLoadingDialog.setCanceledOnTouchOutside(false);
        mLoadingDialog.setContentView(view, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
        mLoadingDialog.show();
        return  mLoadingDialog;
    }

    public static Dialog showDialogForLoading(Activity context) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_dialog, null);
        TextView loadingText = (TextView)view.findViewById(R.id.tv_reminder);
        loadingText.setText("加载中...");

        mLoadingDialog = new Dialog(context, R.style.CustomProgressDialog);
        mLoadingDialog.setCancelable(true);
        mLoadingDialog.setCanceledOnTouchOutside(false);
        mLoadingDialog.setContentView(view, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
        mLoadingDialog.show();
        return  mLoadingDialog;
    }

    /**
     * 关闭加载对话框
     */
    public static void cancelDialogForLoading() {
        if(mLoadingDialog != null) {
            mLoadingDialog.cancel();
        }
    }
}

最后在Activity中调用：

package youhua.com.mytestapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**
 * developer： $(wei)
 * date:created by 2018/9/4  17:32
 * email:[email protected]
 */
public class MainActivity extends AppCompatActivity {
   private TextView btn_loading;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_loading = findViewById(R.id.btn_loading);
        btn_loading.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LoadingDialog.showDialogForLoading(MainActivity.this);
            }
        });

    }

}

备注说明：图片换成美工切的幁图就行了。