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March 18, 2021 19:58
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Up Button Tutorial
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package com.example.application.upbuttonexample; | |
import android.content.Intent; | |
import android.support.v7.app.AppCompatActivity; | |
import android.os.Bundle; | |
import android.view.View; | |
import android.widget.Button; | |
public class Activity2 extends AppCompatActivity { | |
private Button button2; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_2); | |
getSupportActionBar().setTitle("Activity 2"); | |
getSupportActionBar().setDisplayHomeAsUpEnabled(true); | |
button2 = (Button) findViewById(R.id.button2); | |
button2.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View v) { | |
openActivity3(); | |
} | |
}); | |
} | |
public void openActivity3() { | |
Intent intent = new Intent(this, Activity3.class); | |
startActivity(intent); | |
} | |
} |
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package com.example.application.upbuttonexample; | |
import android.support.v7.app.AppCompatActivity; | |
import android.os.Bundle; | |
public class Activity3 extends AppCompatActivity { | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_3); | |
getSupportActionBar().setTitle("Activity 3"); | |
getSupportActionBar().setDisplayHomeAsUpEnabled(true); | |
} | |
} |
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<?xml version="1.0" encoding="utf-8"?> | |
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
tools:context="com.example.application.upbuttonexample.Activity2"> | |
<Button | |
android:id="@+id/button2" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_centerHorizontal="true" | |
android:layout_centerVertical="true" | |
android:text="open activity 3" /> | |
</RelativeLayout> |
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<?xml version="1.0" encoding="utf-8"?> | |
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
tools:context="com.example.application.upbuttonexample.Activity3"> | |
</RelativeLayout> |
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<?xml version="1.0" encoding="utf-8"?> | |
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:tools="http://schemas.android.com/tools" | |
android:layout_width="match_parent" | |
android:layout_height="match_parent" | |
tools:context="com.example.application.upbuttonexample.MainActivity"> | |
<Button | |
android:id="@+id/button" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
android:layout_centerHorizontal="true" | |
android:layout_centerVertical="true" | |
android:text="open activity 2" /> | |
</RelativeLayout> |
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<?xml version="1.0" encoding="utf-8"?> | |
<manifest xmlns:android="http://schemas.android.com/apk/res/android" | |
package="com.example.application.upbuttonexample"> | |
<application | |
android:allowBackup="true" | |
android:icon="@mipmap/ic_launcher" | |
android:label="@string/app_name" | |
android:roundIcon="@mipmap/ic_launcher_round" | |
android:supportsRtl="true" | |
android:theme="@style/AppTheme"> | |
<activity android:name=".MainActivity"> | |
<intent-filter> | |
<action android:name="android.intent.action.MAIN" /> | |
<category android:name="android.intent.category.LAUNCHER" /> | |
</intent-filter> | |
</activity> | |
<activity | |
android:name=".Activity2" | |
android:parentActivityName=".MainActivity"></activity> | |
<activity | |
android:name=".Activity3" | |
android:parentActivityName=".Activity2"></activity> | |
</application> | |
</manifest> |
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package com.example.application.upbuttonexample; | |
import android.content.Intent; | |
import android.support.v7.app.AppCompatActivity; | |
import android.os.Bundle; | |
import android.view.View; | |
import android.widget.Button; | |
public class MainActivity extends AppCompatActivity { | |
private Button button; | |
@Override | |
protected void onCreate(Bundle savedInstanceState) { | |
super.onCreate(savedInstanceState); | |
setContentView(R.layout.activity_main); | |
button = (Button) findViewById(R.id.button); | |
button.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View v) { | |
openActivity2(); | |
} | |
}); | |
} | |
public void openActivity2() { | |
Intent intent = new Intent(this, Activity2.class); | |
startActivity(intent); | |
} | |
} |
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Will using
import androidx.appcompat.app.AppCompatActivity;
rather than
import android.support.v7.app.AppCompatActivity
cause my app to crash when using getSupportActionBar().setTitle("Activity 2"); or
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
I've been unable to get this code to stop crashing?