我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
我想显示一个对话框/弹出窗口,向用户显示一条消息“您确定要删除此条目吗?”,其中一个按钮说“删除”。当点击Delete时,它应该删除该条目,否则什么都不删除。
我已经为这些按钮写了一个点击监听器,但我如何调用对话框或弹出窗口及其功能?
当前回答
我已经创建了一个对话框,用于询问Person是否想呼叫Person。
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;
public class Firstclass extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
ImageView imageViewCall = (ImageView) findViewById(R.id.ring_mig);
imageViewCall.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
try
{
showDialog("0728570527");
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
}
public void showDialog(final String phone) throws Exception
{
AlertDialog.Builder builder = new AlertDialog.Builder(Firstclass.this);
builder.setMessage("Ring: " + phone);
builder.setPositiveButton("Ring", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
Intent callIntent = new Intent(Intent.ACTION_DIAL);// (Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" + phone));
startActivity(callIntent);
dialog.dismiss();
}
});
builder.setNegativeButton("Avbryt", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
}
});
builder.show();
}
}
其他回答
为Kotln开发人员提供最简单的解决方案
val alertDialogBuilder: AlertDialog.Builder = AlertDialog.Builder(requireContext())
alertDialogBuilder.setMessage(msg)
alertDialogBuilder.setCancelable(true)
alertDialogBuilder.setPositiveButton(
getString(android.R.string.ok)
) { dialog, _ ->
dialog.cancel()
}
val alertDialog: AlertDialog = alertDialogBuilder.create()
alertDialog.show()
使用AlertDialog。建造者:
AlertDialog alertDialog = new AlertDialog.Builder(this)
//set icon
.setIcon(android.R.drawable.ic_dialog_alert)
//set title
.setTitle("Are you sure to Exit")
//set message
.setMessage("Exiting will call finish() method")
//set positive button
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what would happen when positive button is clicked
finish();
}
})
//set negative button
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//set what should happen when negative button is clicked
Toast.makeText(getApplicationContext(),"Nothing Happened",Toast.LENGTH_LONG).show();
}
})
.show();
您将得到以下输出。
要查看警报对话框教程使用下面的链接。
Android警报对话框教程
只是当你想解散对话框时要小心——使用dialog.dismiss()。在我的第一次尝试中,我使用了遣散dialog(0)(我可能从某个地方复制),有时它可以工作。使用系统提供的对象听起来是更安全的选择。
showDialog(MainActivity.this, "title", "message", "OK", "Cancel", {...}, {...});
科特林
fun showDialog(context: Context, title: String, msg: String,
positiveBtnText: String, negativeBtnText: String?,
positiveBtnClickListener: DialogInterface.OnClickListener,
negativeBtnClickListener: DialogInterface.OnClickListener?): AlertDialog {
val builder = AlertDialog.Builder(context)
.setTitle(title)
.setMessage(msg)
.setCancelable(true)
.setPositiveButton(positiveBtnText, positiveBtnClickListener)
if (negativeBtnText != null)
builder.setNegativeButton(negativeBtnText, negativeBtnClickListener)
val alert = builder.create()
alert.show()
return alert
}
Java
public static AlertDialog showDialog(@NonNull Context context, @NonNull String title, @NonNull String msg,
@NonNull String positiveBtnText, @Nullable String negativeBtnText,
@NonNull DialogInterface.OnClickListener positiveBtnClickListener,
@Nullable DialogInterface.OnClickListener negativeBtnClickListener) {
AlertDialog.Builder builder = new AlertDialog.Builder(context)
.setTitle(title)
.setMessage(msg)
.setCancelable(true)
.setPositiveButton(positiveBtnText, positiveBtnClickListener);
if (negativeBtnText != null)
builder.setNegativeButton(negativeBtnText, negativeBtnClickListener);
AlertDialog alert = builder.create();
alert.show();
return alert;
}
David Hedlund发布的代码给了我错误:
无法添加窗口-空令牌无效
如果你得到同样的错误,请使用下面的代码。它的工作原理!
runOnUiThread(new Runnable() {
@Override
public void run() {
if (!isFinishing()){
new AlertDialog.Builder(YourActivity.this)
.setTitle("Your Alert")
.setMessage("Your Message")
.setCancelable(false)
.setPositiveButton("ok", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Whatever...
}
}).show();
}
}
});