返回MainActivity Android App

时间:2016-04-05 22:03:38

标签: android android-layout android-studio

我使用导航抽屉和工具栏构建了一个应用程序。我想实现用户可以返回" MainActivity"点击" lable"工具栏。

当以下Acivity正在运行,并且用户点击工具栏时,应该将他/她返回到MainActivity

public class Activity_A extends AppCompatActivity {

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

@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.toolbar) {
        startActivity(new Intent(getApplicationContext(), MainActivity.class));
    }
    return super.onOptionsItemSelected(item);
}
}

我的App_Bar

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="blub">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

</android.support.design.widget.CoordinatorLayout>

清单

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

<uses-permission android:name="android.permission.INTERNET" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".Activity_A" />
    <activity android:name=".Activity_E" />
    <activity android:name=".Login" />
    <activity android:name=".Register" >
    </activity>
</application>

</manifest>

对不起,我对此有点新鲜,问题是,点击没有标签时没有任何反应。谢谢你的帮助。

最诚挚的问候:)

1 个答案:

答案 0 :(得分:0)

您是否已将Activity_A作为主要活动的孩子加入Manifest

 <activity
            android:name=".Activity_A"
            android:parentActivityName=".MainActivity">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="blubb.MainActivity"/>
</activity>