PHP
·
发表于 5年以前
·
阅读量:8410
有两种实现思路,看个人喜好吧:
public class MainActivity extends Activity {
private Toast toast;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toast = Toast.makeText(getApplicationContext(), "确定退出?", 0);
}
public void onBackPressed() {
quitToast();
}
private void quitToast() {
if(null == toast.getView().getParent()) {
toast.show();
}else{
System.exit(0);
}
}
}
public class MainActivity extends Activity {
private Toast toast;
rotected void onCreate(Bundle savedInstanceState) {
...
toast = Toast.makeText(this, "再按一次退出应用", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM, 0, ConversionUtil.dip2px(this, 150));
}
@Override
public void onBackPressed() {
if (doubleBackToExitPressedOnce) {
if(toast!=null){
toast.cancel();
}
super.onBackPressed();
return;
}
this.doubleBackToExitPressedOnce = true;
toast.show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce=false;
}
}, 2000);
}
}