大家一定都在windows下使用过音乐播放器,可以在桌面显示歌词,并且可以随意的移动歌词显示位置,当歌词盖住其他应用程序快捷图标时并不影响鼠标的点击。不知在android中如何实现这种效果?经过几番尝试,终于……还是先上图吧,一看就明白! 现将代码分享给大家,希望大家加以指正并提出宝贵的建议 1.主程序MyFloatViewActivity.java import java.util.Timer;import java.util.TimerTask; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Gravity; import android.view.WindowManager; public class MyFloatViewActivity extends Activity { /** Called when the activity is first created. */ WindowManager wm=null; WindowManager.LayoutParams wmParams=null; MyFloatView myFV=null; public Timer timer; public int index=0; public String[] msgs; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获取歌词并存放在数组中 msgs =getResources().getStringArray(R.array.ge); //创建悬浮窗口 createView(); } private void createView(){ myFV=new MyFloatView(getApplicationContext()); myFV.setText(msgs[index]); myFV.setTextColor(Color.RED);//设置字体颜色 //获取WindowManager wm=(WindowManager)getApplicationContext().getSystemService("window"); //设置LayoutParams(全局变量)相关参数 wmParams = ((MyApplication)getApplication()).getMywmParams(); wmParams.type=2002; wmParams.format=1; wmParams.flags|=8; wmParams.gravity=Gravity.LEFT|Gravity.TOP;//调整悬浮窗口至左上角 //以屏幕左上角为原点,设置x、y初始值 wmParams.x=0; wmParams.y=0; //设置悬浮窗口长宽数据 wmParams.width=120; wmParams.height=40; //显示myFloatView wm.addView(myFV, wmParams); changeText(); } //动态显示歌词 private void changeText(){ final Handler handler=new Handler(){ public void handleMessage(Message msg){ switch(msg.what){ case 1: myFV.setText(msgs[index]); index++; Log.d("index", String.valueOf(index)); //歌词显示完毕时将数组索引值设为0,使其重头开始 if(index==msgs.length){ index=0; } break; } super.handleMessage(msg); } }; TimerTask task=new TimerTask(){ public void run(){ Message message=new Message(); message.what=1; handler.sendMessage(message); } }; timer=new Timer(); //在此可以设置歌词更换时间 timer.schedule(task,1000,2000); } // @Override // public void onDestroy(){ // super.onDestroy(); // //在程序退出(Activity销毁)时销毁悬浮窗口 // wm.removeView(myFV); // } } 2.MyFloatView.java该类继承TextView,显示歌词,处理移动事件 import android.content.Context;import android.util.Log; import android.view.MotionEvent; import android.view.WindowManager; import android.widget.TextView; public class MyFloatView extends TextView { private float mTouchStartX; private float mTouchStartY; private float x; private float y; private WindowManager wm=(WindowManager)getContext().getApplicationContext().getSystemService("window"); private WindowManager.LayoutParams wmParams = ((MyApplication)getContext().getApplicationContext()).getMywmParams(); public MyFloatView(Context context) { super(context); // TODO Auto-generated constructor stub } @Override public boolean onTouchEvent(MotionEvent event) { //获取相对屏幕的坐标,即以屏幕左上角为原点 x = event.getRawX(); y = event.getRawY()-25; //25是系统状态栏的高度 Log.i("currP", "currX"+x+"====currY"+y); switch (event.getAction()) { //手指按下时 case MotionEvent.ACTION_DOWN: //获取相对View的坐标,即以此View左上角为原点 mTouchStartX = event.getX(); mTouchStartY = event.getY(); Log.i("startP", "startX"+mTouchStartX+"====startY"+mTouchStartY); break; //手指移动时 case MotionEvent.ACTION_MOVE: //更新视图 updateViewPosition(); break; //手指松开时 case MotionEvent.ACTION_UP: updateViewPosition(); mTouchStartX=mTouchStartY=0; break; } return true; } private void updateViewPosition(){ //更新浮动窗口位置参数 wmParams.x=(int)( x-mTouchStartX); wmParams.y=(int) (y-mTouchStartY); wm.updateViewLayout(this, wmParams); } } 3.MyApplication.java创建全局变量 import android.app.Application;import android.view.WindowManager; public class MyApplication extends Application { /** * 创建全局变量 * 全局变量一般都比较倾向于创建一个单独的数据类文件,并使用static静态变量 * * 这里使用了在Application中添加数据的方法实现全局变量 * 注意在AndroidManifest.xml中的Application节点添加android:name=".MyApplication"属性 */ private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams(); public WindowManager.LayoutParams getMywmParams(){ return wmParams; } } 4.res/values/下的array.xml文件,用于存放歌词(大家可以尝试一下将歌词文件放在txt文档中) <?xml version="1.0" encoding="utf-8"?> 注意3代码中的注释,记得在AndroidManifest.xml中的Application节点添加android:name=".MyApplication"属性 在AndroidManifest.xml文件中添加权限: <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> |
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