android Spinner的简单实现

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/spinner_text"
    android:textColor="@color/black"
    android:textSize="15sp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="50dp"
    android:gravity="center"
    android:layout_gravity="center"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    >
</TextView>

binFileSpinner = findViewById(R.id.binFileSpinner);
        try {
            String[] tempFileArray = mContext.getAssets().list("");
            Log.e(TAG, "tempFileArray: "+ Arrays.toString(tempFileArray));
            ArrayList<String> file = new ArrayList<String>();
            for(String str:tempFileArray){
                if(str.endsWith(".bin") || str.endsWith(".Bin")){           //只留下bin文件
                    if(!file.contains(str))
                        file.add(str);
                }
            }
            //创建适配器
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getContext(),R.layout.upgrade_spinner_item,file);
            binFileSpinner.setAdapter(adapter);
        } catch (IOException e) {
            e.printStackTrace();
        }

//spinner bin文件选择
        binFileSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                binFileName = binFileSpinner.getSelectedItem().toString();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });