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用户在退出应用前给出一个提示是很有必要的,因为可能是用户并不真的想退出,而只是一不小心按下了返回键,大部分应用也是这么做的,但也有些应用的做法是在应用退出去前给出一个Dialog,我觉得这样不太友好,用户还得移动手指去按dialog中的“确定”按钮。我觉得再按一次“返回”键退出程序是佳的用户体验,实现也很简单,代码如下: |
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private long exitTime = 0 ;
@Override public boolean onKeyDown( int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){
if ((System.currentTimeMillis()-exitTime) > 2000 ){
Toast.makeText(getApplicationContext(), "再按一次退出程序" , Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
finish();
System.exit( 0 );
}
return true ;
}
return super .onKeyDown(keyCode, event);
} |
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<span style= "white-space:pre" > </span> private long exitTime = 0 ;
<span style= "white-space:pre" > </span> @Override
<span style= "white-space:pre" > </span> public boolean onKeyDown( int keyCode, KeyEvent event) {
<span style= "white-space:pre" > </span> // TODO Auto-generated method stub
<span style= "white-space:pre" > </span> switch (keyCode) {
<span style= "white-space:pre" > </span> case KeyEvent.KEYCODE_BACK:
<span style= "white-space:pre" > </span> if ((System.currentTimeMillis() - exitTime) > 2000 ){
<span style= "white-space:pre" > </span>toast( "再按一次返回键退出程序!" );
<span style= "white-space:pre" > </span>exitTime = System.currentTimeMillis();
<span style= "white-space:pre" > </span> return false ;
<span style= "white-space:pre" > </span>} else {
<span style= "white-space:pre" > </span>finish();
<span style= "white-space:pre" > </span>System.exit( 0 );
<span style= "white-space:pre" > </span>}
<span style= "white-space:pre" > </span> break ;
<span style= "white-space:pre" > </span> default :
<span style= "white-space:pre" > </span> break ;
<span style= "white-space:pre" > </span>}
<span style= "white-space:pre" > </span> return super .onKeyDown(keyCode, event);
<span style= "white-space:pre" > </span>}
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