学步园

public class SenseSoccerScoreActivity extends Activity {
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// 如果是返回键,直接返回到桌面
                // 经过测试,如果是乐Phone返回桌面会报错
		if(keyCode == KeyEvent.KEYCODE_BACK){
			// 创建退出系统提示框
			if(notSupportKeyCodeBack()){
	                   new AlertDialog.Builder(this)
	                    .setMessage(this.getText(R.string.sure_exit_app).toString())
	                    .setPositiveButton(R.string.text_ok, new DialogInterface.OnClickListener() {
	            	   public void onClick(DialogInterface dialog, int which) {
	            		exitApp(); // 退出应用处理
	            	   }
	            })
	            .setNegativeButton(R.string.text_cancel, new DialogInterface.OnClickListener() {
	            	public void onClick(DialogInterface dialog, int which) {
	            	}
	            }).create().show();
			} else {
				// 返回桌面,经测试,有一些手机不支持,查看 notSupportKeyCodeBack 方法
				Intent i= new Intent(Intent.ACTION_MAIN);
				i.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); 
				i.addCategory(Intent.CATEGORY_HOME);
				startActivity(i);
				return false;
			}
		}
		return super.onKeyDown(keyCode, event);
	}
        // 经过测试,如果是乐Phone返回桌面会报错
	private boolean notSupportKeyCodeBack(){
		if("3GW100".equals(Build.MODEL)  
                         || "3GW101".equals(Build.MODEL) 
                         || "3GC101".equals(Build.MODEL)) {
			return true;
		}
		return false;
	}
}