android 碎片

1、双击退出

方法1、

rivate int mBackKeyPressedTimes = 0;

        @Override
        public void onBackPressed() {
                if (mBackKeyPressedTimes == 0) {
                        Toast.makeText(this, "再按一次退出程序 ", Toast.LENGTH_SHORT).show();
                        mBackKeyPressedTimes = 1;
                        new Thread() {
                                @Override
                                public void run() {
                                        try {
                                                Thread.sleep(2000);
                                        } catch (InterruptedException e) {
                                                e.printStackTrace();
                                        } finally {
                                                mBackKeyPressedTimes = 0;
                                        }
                                }
                        }.start();
                        return;
                      else{
                               this.activity.finish();
                            }
                }
                super.onBackPressed();
        }

方法2、

  private long exitTime = 0;

        public void ExitApp()
        {
                if ((System.currentTimeMillis() - exitTime) > 2000)
                {
                        Toast.makeText(this.activity, "再按一次退出程序", Toast.LENGTH_SHORT).show();
                        exitTime = System.currentTimeMillis();
                } else
                {
                        this.activity.finish();
                }

        }

 2、Toast 提示

	public void showToast(String text, int time){

		if(mToast!=null)
		{
		    mToast.setText(text);    
		}
		else
		{
			mToast=Toast.makeText(mContext,text,time);
		} 
		mToast.show(); //显示toast信息
	}