如何禁用在android中按下webview的后退按钮?
string u = "select uniqcode from login where users='" + textBoxX1.Text + "' ";
答案 0 :(得分:3)
如果您希望在WebView
可见并启用后退按钮操作时禁用后退按钮操作,如果WebView
处于不可见,请在您的活动中尝试以下代码
@Override
public void onBackPressed() {
if(webview.getVisibility()==View.VISIBLE){
// dont pass back button action
if(webview.canGoBack()){
webview.goBack();
}
return;
}else{
// pass back button action
super.onBackPressed();
}
}
答案 1 :(得分:1)
有很多方法可以实现,
解决方案1,重写dispatchKeyEvent()
dispatchKeyEvent()(API Level 1,Android 1.0)
请参阅我的回答use dispatchKeyEvent to disable back button
if( $a =~ m!Y!i ){
$a = "display something"; //some sentence to display
}
解决方案2,覆盖onBackPressed()
onBackPressed()(API Level 5,Android 2.0)
请参阅Use onBackPressed() to disable back button
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
// TODO Auto-generated method stub
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
return true;
}
return super.dispatchKeyEvent(event);
}
解决方案3,覆盖onKeyDown()
onKeyDown()(API Level 1,Android 1.0)
请参阅Use onKeyDown() to disable back button
@Override
public void onBackPressed() {
}
答案 2 :(得分:0)
您已在“活动”中添加以下代码,以便重新启用禁用活动
@Override
public void onBackPressed() {
}
答案 3 :(得分:0)
只需覆盖onBackPressed()方法。
@Override
public void onBackPressed() { }
答案 4 :(得分:0)
请试试这个
@Override
public void onBackPressed() {
if(webview.canGoBack()){
webview.goBack();
}
else{
super.onBackPressed();
}
}
答案 5 :(得分:0)
Add this below code in java file :
WebView mwebView;
Button backButton1;
backButton1 = findViewById(R.id.backButton1);
mwebView = findViewById(R.id.mwebView);
backButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mWebView.destroy();
}
});