Android自定义吐司

1. 初始化项目:主要是几个按钮,分别调起展示销毁和移动等方法.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:weightSum="3">

    <Button
        android:id="@+id/btn_dispaly"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Display" />

    <Button
        android:id="@+id/btn_gone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Gone" />
    
    <Button
        android:id="@+id/btn_move"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Move" />
</LinearLayout>

public class MainActivity extends Activity implements OnClickListener{

    /**
     * button display
     */
    private Button btnDisplay;
    
    /**
     * button gone
     */
    private Button btnGone;
    
    /**
     * button move
     */
    private Button btnMove;
    
    /**
     * def toast class
     */
    private MyToast myToast;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.activity_main);
        
        init();
    }

    private void init() {
        btnDisplay = (Button) this.findViewById(R.id.btn_dispaly);
        btnDisplay.setOnClickListener(this);
        
        btnGone = (Button) this.findViewById(R.id.btn_gone);
        btnGone.setOnClickListener(this);
        
        btnMove = (Button) this.findViewById(R.id.btn_move);
        btnMove.setOnClickListener(this);
        
        myToast = new MyToast(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.btn_dispaly){
            myToast.simpleDisplay("show toast for test");
        }
        
        if(v.getId() == R.id.btn_move){
            myToast.moveToast("move toast for test");
        }
        
        if(v.getId() == R.id.btn_gone){
            myToast.destoryToast();
        }
    }
}

2. 定义Toast类:MyToast

public class MyToast {

    /**
     * View inflater
     */
    private LayoutInflater inflater = null;

    /**
     * prop window for toast
     */
    private WindowManager windowManage;

    /**
     * Toast show view
     */
    private View view = null;

    /**
     * toast show params
     */
    private WindowManager.LayoutParams params = null;

    /**
     * 
     * @param context
     */
    public MyToast(Context context) {
        inflater = LayoutInflater.from(context);

        params = new WindowManager.LayoutParams();

        windowManage = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    }

    /**
     * toast display and moveable
     * @param text
     */
    public void moveToast(String text) {
        checkParamsEnv(text);
        
        // inflate view
        view = inflater.inflate(R.layout.activity_toast, null);
        
        // init toast view
        TextView tvDesc = (TextView) view.findViewById(R.id.tv_toast_desc);

        tvDesc.setText(text);
        
        // set display location
        params.gravity = Gravity.CENTER;

        params.width = WindowManager.LayoutParams.WRAP_CONTENT;

        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        
        // add touch listener for move
        view.setOnTouchListener(new OnTouchListener() {
            
            int initX,initY;
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                switch (event.getAction()) {
                
                // touch down
                case MotionEvent.ACTION_DOWN:
                    
                    initX = (int) event.getRawX();
                    
                    initY = (int) event.getRawY();
                    
                    break;
                
                // touch move
                case MotionEvent.ACTION_MOVE:
                    
                    int newX = (int) event.getRawX();
                    
                    int newY = (int) event.getRawY();
                    
                    int dx = newX - initX;
                    
                    int dy = newY - initY;
                    
                    params.x += dx;
                    
                    params.y += dy;
                    
                    windowManage.updateViewLayout(view, params);
                    
                    initX = (int) event.getRawX();
                    
                    initY = (int) event.getRawY();
                    
                    break;
                
                // touch up
                case MotionEvent.ACTION_UP:
                    break;
                default:
                    break;
                }

                return false;
            }
        });
        
        // set params flags for keep screen on and no focusable
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        
        params.format = PixelFormat.TRANSLUCENT;
        
        // toast display type
        params.type = WindowManager.LayoutParams.TYPE_TOAST;

        // pop window 
        windowManage.addView(view, params);
    }

    /**
     * simple toast show
     * @param text
     */
    public void simpleDisplay(String text) {

        checkParamsEnv(text);

        view = inflater.inflate(R.layout.activity_toast, null);

        TextView tvDesc = (TextView) view.findViewById(R.id.tv_toast_desc);

        tvDesc.setText(text);

        params.gravity = Gravity.CENTER;

        params.width = WindowManager.LayoutParams.WRAP_CONTENT;

        params.height = WindowManager.LayoutParams.WRAP_CONTENT;

        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;

        params.format = PixelFormat.TRANSLUCENT;

        params.type = WindowManager.LayoutParams.TYPE_TOAST;

        windowManage.addView(view, params);
    }

    public void destoryToast() {
        if (view != null) {
            windowManage.removeView(view);
        }
    }

    private void checkParamsEnv(String text) {
        if (text == null || "".equals(text)) {
            return;
        }
    }
}