java - 在Eclipse上进行Android开发:将 Activity 1更改为 Activity 2正常，而不是3

对不起，我的英语不好，我说法语。
我正在尝试通过4个 Activity 制作一个简单的应用程序。
在第一个 Activity (MainActivity)中，如果我单击“rechercher”按钮，它将切换到第二个 Activity (RechercherActivity)。然后，我可以返回MainActivity。

在MainActivity中，我可以单击3个按钮(“rechercher”，“trouvez”和“liste”)。
即使我以相同的方式创建了它们，第一个也可以，但是其他两个则不能。 “RechercherActivity”是我所做的那三项中的第一项。

当我单击“trouvez”或“liste”时，出现“应用程序停止工作”错误消息，这就是LogCat上显示的内容:问题从第二行开始。

    package com.example.jouons;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setupTrouvezButton();
        setupRechercherButton();
        setupListeButton();
    }

    private void setupListeButton() {
        Button listeButton = (Button) findViewById(R.id.btnMainListe);

        listeButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, ListeActivity.class));
            }
        });
    }

    private void setupTrouvezButton() {
        Button trouvezButton = (Button) findViewById(R.id.btnMainTrouvez);

        trouvezButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, TrouvezActivity.class));
            }
        });
    }

    private void setupRechercherButton() {
        Button rechercherButton = (Button) findViewById(R.id.btnMainRechercher);

        rechercherButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, RechercherActivity.class));
            }
        });
    }

    @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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

和

    package com.example.jouons;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class RechercherActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rechercher);

        setupRetourButton();
    }

    private void setupRetourButton() {
        Button retourButton = (Button) findViewById(R.id.btnRechercherRetour);

        retourButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(RechercherActivity.this, MainActivity.class));
            }
        });

    }

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

和

 package com.example.jouons;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class TrouvezActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_trouvez);

        setupRetourButton();
    }

    private void setupRetourButton() {
        Button retourButton = (Button) findViewById(R.id.btnRechercherRetour);

        retourButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                startActivity(new Intent(TrouvezActivity.this, MainActivity.class));
            }
        });

    }

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

和

    package com.example.jouons;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class ListeActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_liste);

        setupRetourButton();
    }

    private void setupRetourButton() {
        Button retourButton = (Button) findViewById(R.id.btnRechercherRetour);

        retourButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ListeActivity.this, MainActivity.class));
            }
        });

    }

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

和

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.jouons"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".RechercherActivity"
            android:label="@string/title_activity_rechercher" >
        </activity>
        <activity
            android:name=".TrouvezActivity"
            android:label="@string/title_activity_trouvez" >
        </activity>
        <activity
            android:name=".ListeActivity"
            android:label="@string/title_activity_liste" >
        </activity>
    </application>

</manifest>

谢谢!

最佳答案

您应该在OnClickListener中重写onClick方法。

private void setupListeButton() {
        Button listeButton = (Button) findViewById(R.id.btnMainListe);

        listeButton.setOnClickListener(new View.OnClickListener() {
            @Override         // this is what you are forgetting
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, ListeActivity.class));
            }
        });
    }