原本想通過framelayout實現一個懸浮在其他控件上的按鈕,但是覺得很麻煩,需要各個界面都要動態填充.于是想到了懸浮窗,就自定一個ImageView用于顯示全局按鈕.
一、首先因為懸浮窗式的所以要添加權限,對于SDK>=23的需要動態獲取權限,我這邊用的是22的
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
二、通過application獲取到全局性的WindowManager的params數據
private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams(); public WindowManager.LayoutParams getMywmParams(){ return wmParams; }三、自定義ImageView,并實現點擊具有狀態選擇.其中寫了一個回調接口用于對點擊事件的處理
public class CustomeMovebutton extends ImageView { private final int statusHeight; int sW; int sH; private float mTouchStartX; private float mTouchStartY; private float x; private float y; private boolean isMove=false; private Context context; private WindowManager wm = (WindowManager) getContext().getApplicationContext().getSystemService(Context.WINDOW_SERVICE); private WindowManager.LayoutParams wmParams = ((MyApplication) getContext().getApplicationContext()).getMywmParams(); private float mLastX; private float mLastY; private float mStartX; private float mStartY; private long mDownTime; private long mUpTime; private OnSpeakListener listener; public CustomeMovebutton(Context context) { this(context,null); this.context = context; } public CustomeMovebutton(Context context, AttributeSet attrs) { this(context, attrs,-1); } public CustomeMovebutton(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs,defStyleAttr); sW = wm.getDefaultDisplay().getWidth(); sH = wm.getDefaultDisplay().getHeight(); statusHeight = getStatusHeight(context); } /** * 狀態欄的高度 * */ public static int getStatusHeight(Context context) { int statusHeight = -1; try { Class clazz = Class.forName("com.android.internal.R$dimen"); //使用反射獲取實例 Object object = clazz.newInstance(); int height = Integer.parseInt(clazz.getField("status_bar_height") .get(object).toString()); statusHeight = context.getResources().getDimensionPixelSize(height); } catch (Exception e) { e.printStackTrace(); } return statusHeight; } @Override public boolean onTouchEvent(MotionEvent event) { //獲取相對屏幕的坐標，即以屏幕左上角為原點 x = event.getRawX(); y = event.getRawY() - statusHeight; //statusHeight是系統狀態欄的高度 switch (event.getAction()) { case MotionEvent.ACTION_DOWN: //按下 setImageResource(R.drawable.btn_voice_pressed); mTouchStartX = event.getX(); mTouchStartY = event.getY(); mStartX = event.getRawX(); mStartY = event.getRawY(); mDownTime = System.currentTimeMillis(); isMove = false; break; case MotionEvent.ACTION_MOVE: //手指移動 updateViewPosition(); isMove = true; break; case MotionEvent.ACTION_UP: //手抬起 setImageResource(R.drawable.btn_voice_rest); mLastX = event.getRawX(); mLastY = event.getRawY(); mUpTime = System.currentTimeMillis(); //按下到抬起的時間大于500毫秒,并且抬手到抬手絕對值大于20像素處理點擊事件 if(mUpTime - mDownTime < 500){ if(Math.abs(mStartX- mLastX )< 20.0 && Math.abs(mStartY - mLastY) < 20.0){ if (listener!=null){ listener.onSpeakListener(); } } } break; } return true; } private void updateViewPosition() { wmParams.x = (int) (x - mTouchStartX); wmParams.y = (int) (y- mTouchStartY); wm.updateViewLayout(this, wmParams); //刷新顯示 } /** * 設置點擊回調接口 */ public interface OnSpeakListener{ void onSpeakListener(); } public void setOnSpeakListener(OnSpeakListener listener){ this.listener=listener; }}四、Activity中使用,其中有設置圖片的參數和位置參數
public class MainActivity extends AppCompatActivity{ private WindowManager wm; private WindowManager.LayoutParams wmParams; private CustomeMovebutton CustomeMovebutton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE); DisplayMetrics dm = getResources().getDisplayMetrics(); int widthPixels = dm.widthPixels; int heightPixels = dm.heightPixels; wmParams = ((MyApplication) getApplication()).getMywmParams(); wmParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; wmParams.format= PixelFormat.RGBA_8888;//設置背景圖片 wmParams.flags= WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE ;// wmParams.gravity = Gravity.LEFT|Gravity.TOP;// wmParams.x = widthPixels-150; //設置位置像素 wmParams.y = heightPixels-110; wmParams.width=200; //設置圖片大小 wmParams.height=200; CustomeMovebutton = new CustomeMovebutton(getApplicationContext()); CustomeMovebutton.setImageResource(R.drawable.btn_voice_rest); wm.addView(CustomeMovebutton, wmParams); CustomeMovebutton.setOnSpeakListener(new CustomeMovebutton.OnSpeakListener() { @Override public void onSpeakListener() { Toast.makeText(MainActivity.this, "點擊事件", Toast.LENGTH_SHORT).show(); } }); } @Override protected void onDestroy() { super.onDestroy(); if(CustomeMovebutton != null){ wm.removeView(CustomeMovebutton); } }}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
新聞熱點
疑難解答
