android中懸浮顯示可拖動的工具欄

jopen 10年前發布 | 47K 次閱讀 Android Android開發 移動開發

下面的示例是仿QQ音樂之類的歌詞欄，可以進行拖動和隱藏，代碼如下：

MainActivity：

    package com.home.danglingactivity;



import android.app.Activity;  
import android.content.Context;  
import android.graphics.Rect;  
import android.os.Bundle;  
import android.view.Gravity;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.view.Window;  
import android.view.WindowManager;  
import android.view.WindowManager.LayoutParams;  
import android.widget.Button;  

public class MainActivity extends Activity implements OnClickListener {  
    private MyTextView tv;  
    private Button btn;  

    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        requestWindowFeature(Window.FEATURE_NO_TITLE);  
        setContentView(R.layout.activity_main);  
        btn = (Button) findViewById(R.id.main_btn);  
        btn.setOnClickListener(this);  
    }  

    @Override  
    public void onClick(View v) {  
        if (tv != null && tv.isShown()) {  
            hide();  
        } else {  
            show();  
        }  
    }  

    /** 
     * 隱藏顯示歌詞的TextView 
     */  
    private void hide() {  
        WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);  
        wm.removeView(tv);  
        btn.setText("顯示歌詞");  
    }  

    /** 
     * 顯示懸浮的TextView 
     */  
    private void show() {  
        Rect frame = new Rect();  
        getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);  
        MyTextView.TOOL_BAR_HIGH = frame.top;  
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);  
        WindowManager.LayoutParams params = MyTextView.params;  

        params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT  
                | WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;  
        params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL  
                | LayoutParams.FLAG_NOT_FOCUSABLE;  
        params.width = WindowManager.LayoutParams.FILL_PARENT;  
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;  
        params.alpha = 80;  
        params.gravity = Gravity.LEFT | Gravity.TOP;  
        // 設置x、y初始值  
        params.x = 0;  
        params.y = wm.getDefaultDisplay().getHeight();  

        tv = new MyTextView(MainActivity.this);  
        wm.addView(tv, params);  
        btn.setText("隱藏歌詞");  
    }  

    @Override  
    protected void onDestroy() {  
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);  
        if (tv != null && tv.isShown()) {  
            wm.removeView(tv);  
        }  
        super.onDestroy();  
    }  

}  </pre><a style="text-indent:0px;" title="派生到我的代碼片" href="/misc/goto?guid=4959614223407056575" target="_blank"></a></div>



</div>
</div>


MyTextView：






    package com.home.danglingactivity;



import android.content.Context;  
import android.graphics.Canvas;  
import android.graphics.Color;  
import android.graphics.LinearGradient;  
import android.graphics.Paint;  
import android.graphics.Shader;  
import android.graphics.Shader.TileMode;  
import android.graphics.Typeface;  
import android.view.MotionEvent;  
import android.view.WindowManager;  
import android.widget.TextView;  

public class MyTextView extends TextView {  
    private final String TAG = MyTextView.class.getSimpleName();  
    public static int TOOL_BAR_HIGH = 0;  
    public static WindowManager.LayoutParams params = new WindowManager.LayoutParams();  
    private float startX;  
    private float startY;  
    private float x;  
    private float y;  
    private String text = "我是不是你最疼愛的人，你為什么不說話，握住是你冰冷的手動也不動讓我好難過";;  
    private float float1 = 0.0f;  
    private float float2 = 0.01f;  
    WindowManager wm = (WindowManager) getContext().getApplicationContext()  
            .getSystemService(Context.WINDOW_SERVICE);  

    public MyTextView(Context context) {  
        super(context);  
        this.setBackgroundColor(Color.argb(100, 140, 160, 150));  
    }  

    @Override  
    public boolean onTouchEvent(MotionEvent event) {  
        // 觸摸點相對于屏幕左上角坐標  
        x = event.getRawX();  
        y = event.getRawY() - TOOL_BAR_HIGH;  
        switch (event.getAction()) {  
        case MotionEvent.ACTION_DOWN:  
            startX = event.getX();  
            startY = event.getY();  
            break;  
        case MotionEvent.ACTION_MOVE:  
            updatePosition();  
            break;  
        case MotionEvent.ACTION_UP:  
            updatePosition();  
            startX = startY = 0;  
            break;  
        }  
        return true;  
    }  

    @Override  
    protected void onDraw(Canvas canvas) {  
        super.onDraw(canvas);  
        float1 += 0.001f;  
        float2 += 0.001f;  
        if (float2 > 1.0) {  
            float1 = 0.0f;  
            float2 = 0.01f;  
        }  
        this.setText("");  
        float len = this.getTextSize() * text.length();  
        Shader shader = new LinearGradient(0, 0, len, 0, new int[] {  
                Color.YELLOW, Color.RED }, new float[] { float1, float2 },  
                TileMode.CLAMP);  
        Paint p = new Paint();  
        p.setShader(shader);  
        p.setTypeface(Typeface.DEFAULT_BOLD);  
        canvas.drawText(text, 0, 10, p);  
    }  

    /** 
     * 更新浮動窗口位置參數 
     */  
    private void updatePosition() {  
        // View的當前位置  
        params.x = (int) (x - startX);  
        params.y = (int) (y - startY);  
        wm.updateViewLayout(this, params);  
    }  
}  </pre><a style="text-indent:0px;" title="派生到我的代碼片" href="/misc/goto?guid=4959614223407056575" target="_blank"></a></div>



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布局xml:






    <?xml version="1.0" encoding="utf-8"?>

    <LinearLayout xmlns:android="
        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="vertical" >



    <Button  
        android:id="@+id/main_btn"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_gravity="center"  
        android:text="顯示歌詞" />  

</LinearLayout>  </pre><a style="text-indent:0px;" title="派生到我的代碼片" href="/misc/goto?guid=4959614223407056575" target="_blank"></a></div>



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權限：






<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />  
<uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />  

</div>
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來自：http://blog.csdn.net/u010142437/article/details/17509587

                    

                    

                        
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