警报对话框中的取消按钮不起作用

Question

我正在开发 Android 中的警报对话框。警报对话框显示正常， 但是取消按钮无法正常工作：单击取消按钮时，未找到 OnClick 方法“取消对话框”，尽管它位于主活动中，并且我正在将对话框实例传递给该方法。我不知道为什么；因此，任何帮助将不胜感激。

Logcat 显示如下错误：

11-01 21:10:30.111 11217-11217/de.die_web_agenten.www.batprice E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                 Process: de.die_web_agenten.www.batprice, PID: 11217
                                                                                 java.lang.IllegalStateException: Could not find method cancelDialog(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'dialog_cancel'
                                                                                     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
                                                                                     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
                                                                                     at android.view.View.performClick(View.java:5198)
                                                                                     at android.view.View$PerformClick.run(View.java:21147)
                                                                                     at android.os.Handler.handleCallback(Handler.java:739)
                                                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                     at android.os.Looper.loop(Looper.java:148)
                                                                                     at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-01 21:10:34.599 11217-11217/de.die_web_agenten.www.batprice I/Process: Sending signal. PID: 11217 SIG: 9

这是主要活动：

import android.app.Dialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.facebook.FacebookSdk;
import com.facebook.appevents.AppEventsLogger;


public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        openDialog();

        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Contact us", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
                Uri uri = Uri.parse("http://www.die-web-agenten.de/en/kontaktaufnahme/");
                Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                startActivity(intent);
            }
        });

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();
        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

    }

    @Override
    protected void onResume() {
        super.onResume();

        // Logs 'install' and 'app activate' App Events.
        AppEventsLogger.activateApp(this);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Logs 'app deactivate' App Event.
        AppEventsLogger.deactivateApp(this);
    }

    @Override
    public void onBackPressed() {

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.nav_results) {
            // Handle the camera action
            Intent SecondListActivityIntent = new Intent(MainActivity.this, de.die_web_agenten.www.batprice.SecondListActivity.class);
            MainActivity.this.startActivity(SecondListActivityIntent);

        } else if (id == R.id.nav_map) {

            // Handle the camera action

            Intent MapsActivityIntent = new Intent(MainActivity.this, MapsActivity.class);
            //ListActivity.putExtra("key", value); //Optional parameters
            MainActivity.this.startActivity(MapsActivityIntent);

            //Intent ListActivityIntent = new Intent(MainActivity.this, ListActivity.class);
            //ListActivity.putExtra("key", value); //Optional parameters
            //MainActivity.this.startActivity(ListActivityIntent);

        } else if (id == R.id.nav_results) {
            // Handle the camera action
            Intent ResultsActivityIntent = new Intent(MainActivity.this, de.die_web_agenten.www.batprice.ResultsActivity.class);
            //ListActivity.putExtra("key", value); //Optional parameters
            MainActivity.this.startActivity(ResultsActivityIntent);

        } /*else if (id == R.id.nav_training) {
            // Handle the camera action
            Intent TrainingActivityIntent = new Intent(MainActivity.this, de.die_web_agenten.www.batprice.TrainingActivity.class);
            //ListActivity.putExtra("key", value); //Optional parameters
            MainActivity.this.startActivity(TrainingActivityIntent);

        } */
         else if (id == R.id.nav_share) {
            // Handle the camera action
            Intent AndroidBarcodeQRExampleIntent = new Intent(MainActivity.this, de.die_web_agenten.www.batprice.AndroidBarcodeQrExample.class);
            //ListActivity.putExtra("key", value); //Optional parameters
            MainActivity.this.startActivity(AndroidBarcodeQRExampleIntent);

        } else if (id == R.id.nav_send) {
            // Handle the camera action

                    Uri uri = Uri.parse("http://www.die-web-agenten.de/en/kontaktaufnahme/");
                    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                    startActivity(intent);
                }
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }


    public void OpenListActivity() {
        Intent SecondListActivityIntent = new Intent(MainActivity.this, de.die_web_agenten.www.batprice.SecondListActivity.class);
        //ListActivity.putExtra("key", value); //Optional parameters
        MainActivity.this.startActivity(SecondListActivityIntent);

    }

    public void openDialog() {
        final Dialog dialog = new Dialog(this); // Context, this, etc.
        dialog.setContentView(R.layout.dialog_demo);
        dialog.setTitle(R.string.dialog_title);
        dialog.show();
    }

    public void cancelDialog(Dialog dialog) {
        dialog.dismiss();
    }

}

这是对应的对话框演示布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/dialog_info"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="@string/dialog_text"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/dialog_info">

        <Button
            android:id="@+id/dialog_cancel"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.50"
            android:text="Cancel"
            android:onClick="cancelDialog"/>

        <Button
            android:id="@+id/dialog_ok"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.50"
            android:text="Check voucher"/>

        <Button
            android:id="@+id/buttonAlert"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Show Alert Box" />
    </LinearLayout>
</RelativeLayout>

Answer 1

您以错误的方式实施它。你可以这样做

private Dialog dialog;

public void openDialog() {
dialog = new Dialog(this); // Context, this, etc.
dialog.setContentView(R.layout.dialog_demo);
dialog.setTitle(R.string.dialog_title);
dialog.show();

}

public void cancelDialog(View view) {
dialog.dismiss();
}

cancelDialog 方法需要 View 类型的参数，而您正试图将其作为 Dialog 传递。这就是您的应用程序崩溃的原因。希望它会帮助你。

Answer 2

可能是这样的

Dialog dialog;
public void openDialog() {
    dialog = new Dialog(this); // Context, this, etc.
    dialog.setContentView(R.layout.dialog_demo);
    dialog.setTitle(R.string.dialog_title);
    dialog.show();
}

public void cancelDialog() {
    dialog.dismiss();
}

Answer 3

您的 cancelDialog 方法需要一个 Dialog 类型的参数，而您的错误消息告诉您找不到参数类型为 View 的方法。

我的 android 时代已经结束了一段时间，但我认为您需要接受 View 作为参数（这是按钮所在的视图）并关闭它，而不是仅仅关闭对话框。

Answer 4

这很明显，因为如果您在 XML 上的 View 上定义 onClick 以运行方法，则该方法本身将需要 View，这是您在 XML 上定义的 View，同时您传递 Dialog到那个方法。在您的情况下，您传递 Button 而不是 Dialog。

删除

public void cancelDialog(Dialog dialog) {
    dialog.dismiss();
}

和

android:onClick="cancelDialog"

在您的 dialog_cancel 按钮上。 然后将 openDialog 方法编辑成这样：

public void openDialog() {
    final Dialog dialog = new Dialog(this); // Context, this, etc.
    dialog.setContentView(R.layout.dialog_demo);
    dialog.setTitle(R.string.dialog_title);
    View vCancel = dialog.findViewById(R.id.dialog_cancel);
    vCancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
        }
    });
    dialog.show();
}

Answer 5

试试这个代码

Dialog dialog;
public void openDialog() {
    dialog = new Dialog(this); // Context, this, etc.
    dialog.setContentView(R.layout.dialog_demo);
    dialog.setTitle(R.string.dialog_title);
    dialog.show();
}

public void cancelDialog() { 
    dialog.dismiss();
}

您将按钮视图传递给cancelDialog(View) 而不是cancelDialog(Dialog v)

Answer 6

你应该扩展对话框类并将你的“onclick”方法放在那里。

这应该对你有帮助：Using onClick attribute in layout xml causes a NoSuchMethodException in Android dialogs

Answer 7

This should be able to help:

  private void openDialog() {

  LayoutInflater layoutInflaterAndroid = LayoutInflater.from(BaseActivity.this);
        View view = layoutInflaterAndroid.inflate(R.layout.edit_remark_dialog, null);
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(BaseActivity.this);
        alertDialogBuilder.setView(view);
        final AlertDialog alertDialog = alertDialogBuilder.create();

        Button btnEdit = (Button) view.findViewById(R.id.btn_edit);
        Button btnDelete = (Button) view.findViewById(R.id.btn_delete);
        final EditText etRemark = (EditText) view.findViewById(R.id.et_remark);
        TextView tvTitle = (TextView) view.findViewById(R.id.tv_title);
        TextView tvMessage = (TextView) view.findViewById(R.id.tv_msg);


        tvTitle.setText(getResources().getString(R.string.exit_app));
        tvMessage.setText(getResources().getString(R.string.are_you_sure_want_exit));
        btnEdit.setText(getResources().getString(R.string.no));
        btnDelete.setText(getResources().getString(R.string.yes));
        btnEdit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                alertDialog.dismiss();
            }
        });
        btnDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                finish();
                alertDialog.dismiss();
            }
        });

        alertDialog.show();

    }

Answer 8

只在类声明中声明对话框，cancleDialog方法中不需要传递对话框参数。当您显示对话框时，只需调用方法打开对话框，当您关闭对话框时调用 cancleDialog 方法

Dialog dialog;
public void openDialog() {
        dialog = new Dialog(this); // Context, this, etc.
        dialog.setContentView(R.layout.dialog_demo);
        dialog.setTitle(R.string.dialog_title);
        dialog.show();
    }

    public void cancelDialog() {
        dialog.dismiss();
    }