Android 小知识点

1：动态改变 layout 大小

 LayoutParams params = myview.getLayoutParams(); params.width = LinearLayout.LayoutParams.FILL_PARENT; params.height = 330;    myview.setLayoutParams(params);

2：SurfaceView 刷新时，surfaceView.setZOrderOnTop(true); 可以使SurfaceView 显示在最上层，多个SurfaceView叠加刷新时需注意

3：Back 和 Home 键监听

<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/> Home键需要

@Override

public void onAttachedToWindow() { // Home键需要

// 注意：此方法和 android全屏设置有冲突，2.1之前好像没冲突，2.2开始就不行了，只能隐藏掉title，状态栏隐藏不掉

// 有猜测是 android安全机制，防止恶意程序无法操作设备

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);

super.onAttachedToWindow();
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
if (KeyEvent.KEYCODE_BACK == keyCode) {
// android.os.Process.killProcess(android.os.Process.myPid());
System.out.println("------------- onKeyDown KeyEvent.KEYCODE_BACK nothing ");
}
if (KeyEvent.KEYCODE_HOME == keyCode) {
System.out.println("------------- onKeyDown KeyEvent.KEYCODE_HOME nothing ");
}
return super.onKeyDown(keyCode, event);
}
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (KeyEvent.KEYCODE_BACK == keyCode) {
System.out.println("--- onKeyUp KeyEvent.KEYCODE_BACK nothing ");
}
if (keyCode == KeyEvent.KEYCODE_HOME) {
System.out.println("--- KonKeyUp eyEvent.KEYCODE_HOME nothing ");
}
return super.onKeyUp(keyCode, event);
}
private OnClickListener bt_refresh_lis = new Button.OnClickListener() {
public void onClick(View v) {
refreshFileName();
}
};

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