Android Studio:使用 ImageButton 启动新 activity 会使应用程序崩溃
Android Studio: Using ImageButton to start new activity crashes the app
我正在设计一个主屏幕有 6 个图像按钮的应用程序,所有按钮都可以启动新活动。
目前,当我按下按钮时,应用程序崩溃了。然而这很奇怪,因为我用常规按钮完成了这个项目并且它工作正常,而且我也这样做了所以当按下图像按钮时它只在你的屏幕上打印 "Clicked!" 而且这也工作正常,所以问题是开始一个新的 activity.
MainActivity.java
package com.example.darren1.homemanagementsystem;
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageButton;
import android.view.View.OnClickListener;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findAllViewsById();
}
private void findAllViewsById(){
ImageButton lightButton = (ImageButton) findViewById(R.id.lightButton);
lightButton.setOnClickListener(new View.OnClickListener() {
public void onClick (View v){
Intent intent = new Intent(MainActivity.this, LightingActivity.class);
startActivity(intent);
}
});
}
}
activity_main.xml
<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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="#feae5e"
android:clickable="true">
<GridLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:background="#feae5e"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true">
<ImageButton
android:layout_width="137dp"
android:layout_height="133dp"
android:id="@+id/cameraButton"
android:layout_row="0"
android:layout_column="0"
android:src="@drawable/rsz_cameraicon"
android:background="#feae5e" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/alarmButton"
android:layout_row="0"
android:layout_column="13"
android:src="@drawable/rsz_alarmicon"
android:background="#feae5e" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/fireButton"
android:layout_row="1"
android:layout_column="0"
android:src="@drawable/rsz_fireicon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lightButton"
android:layout_row="1"
android:layout_column="13"
android:src="@drawable/rsz_lightbulbicon"
android:background="#feae5e"
android:layout_marginTop="40dp"
/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/thermoButton"
android:layout_row="2"
android:layout_column="0"
android:src="@drawable/rsz_1thermometericon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tvButton"
android:layout_row="2"
android:layout_column="13"
android:src="@drawable/rsz_1tvicon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
</GridLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.darren1.homemanagementsystem" >
<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" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LightingActivity"
android:label="Light" >
</activity>
<activity android:name=".TelevisionActivity"
android:label="TV">
</activity>
</application>
activity_lighting.xml
<?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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.darren1.homemanagementsystem.LightingActivity"
android:background="#beddeb">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true"
android:layout_alignParentStart="false"
android:id="@+id/linearLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/lighting"
android:id="@+id/lightingView"
android:layout_gravity="center_horizontal"
android:textSize="32dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="150dp"
android:layout_height="200dp"
android:layout_below="@+id/linearLayout"
android:layout_alignParentStart="true"
android:layout_marginTop="66dp"
android:id="@+id/linearLayout2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/kitchen"
android:id="@+id/kitchenLight" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/sittingroom"
android:id="@+id/sittingroomLight"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/bedroom"
android:id="@+id/bedroomLight"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/outside"
android:id="@+id/outsideLight"
android:layout_marginTop="20dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="150dp"
android:layout_height="200dp"
android:layout_alignTop="@+id/linearLayout2"
android:layout_alignEnd="@+id/linearLayout"
android:id="@+id/linearLayout3">
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch1" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch2"
android:layout_marginTop="20dp" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch3"
android:layout_marginTop="20dp" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch4"
android:checked="false"
android:layout_marginTop="20dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="@string/backButton"
android:id="@+id/backButton"
android:layout_gravity="center_horizontal"
android:background="#010101"
android:textColor="#fefdfd"
android:textStyle="bold"
android:textSize="20dp" />
</LinearLayout>
LightingActivity.java
包裹 com.example.darren1.homemanagementsystem;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View.OnClickListener;
public class LightingActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setTitle("Light");
setContentView(R.layout.activity_lighting);
onClickListenerButton();
}
public void onClickListenerButton(){
Intent i = getIntent();
}
}
不正确:
setContentView(R.layout.activity_light);
-> activity_lighting.xml
不同的名字。
但是你有另一个不同的名字:
setContentView(R.layout.activity_main);
-> activity_mainn.xml
(可能是输入错误)
我猜问题出在这两行:
getActionBar().setTitle("Light");
setContentView(R.layout.activity_lighting);
你应该先放 setContentView()
,然后放 ActionBar
的 Title
If I were you I'd start using [
Toolbar](http://developer.android.com/reference/android/widget/Toolbar.html)
Do the
setTitle()` 如下:
ActionBar actionBar = getActionBar();
actionBar.setTitle("Light");
看到这个answer for more detail
我正在设计一个主屏幕有 6 个图像按钮的应用程序,所有按钮都可以启动新活动。
目前,当我按下按钮时,应用程序崩溃了。然而这很奇怪,因为我用常规按钮完成了这个项目并且它工作正常,而且我也这样做了所以当按下图像按钮时它只在你的屏幕上打印 "Clicked!" 而且这也工作正常,所以问题是开始一个新的 activity.
MainActivity.java
package com.example.darren1.homemanagementsystem;
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageButton;
import android.view.View.OnClickListener;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findAllViewsById();
}
private void findAllViewsById(){
ImageButton lightButton = (ImageButton) findViewById(R.id.lightButton);
lightButton.setOnClickListener(new View.OnClickListener() {
public void onClick (View v){
Intent intent = new Intent(MainActivity.this, LightingActivity.class);
startActivity(intent);
}
});
}
}
activity_main.xml
<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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="#feae5e"
android:clickable="true">
<GridLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:background="#feae5e"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true">
<ImageButton
android:layout_width="137dp"
android:layout_height="133dp"
android:id="@+id/cameraButton"
android:layout_row="0"
android:layout_column="0"
android:src="@drawable/rsz_cameraicon"
android:background="#feae5e" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/alarmButton"
android:layout_row="0"
android:layout_column="13"
android:src="@drawable/rsz_alarmicon"
android:background="#feae5e" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/fireButton"
android:layout_row="1"
android:layout_column="0"
android:src="@drawable/rsz_fireicon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lightButton"
android:layout_row="1"
android:layout_column="13"
android:src="@drawable/rsz_lightbulbicon"
android:background="#feae5e"
android:layout_marginTop="40dp"
/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/thermoButton"
android:layout_row="2"
android:layout_column="0"
android:src="@drawable/rsz_1thermometericon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tvButton"
android:layout_row="2"
android:layout_column="13"
android:src="@drawable/rsz_1tvicon"
android:background="#feae5e"
android:layout_marginTop="40dp" />
</GridLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.darren1.homemanagementsystem" >
<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" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LightingActivity"
android:label="Light" >
</activity>
<activity android:name=".TelevisionActivity"
android:label="TV">
</activity>
</application>
activity_lighting.xml
<?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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.darren1.homemanagementsystem.LightingActivity"
android:background="#beddeb">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_centerHorizontal="true"
android:layout_alignParentTop="true"
android:layout_alignParentStart="false"
android:id="@+id/linearLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/lighting"
android:id="@+id/lightingView"
android:layout_gravity="center_horizontal"
android:textSize="32dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="150dp"
android:layout_height="200dp"
android:layout_below="@+id/linearLayout"
android:layout_alignParentStart="true"
android:layout_marginTop="66dp"
android:id="@+id/linearLayout2">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/kitchen"
android:id="@+id/kitchenLight" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/sittingroom"
android:id="@+id/sittingroomLight"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/bedroom"
android:id="@+id/bedroomLight"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/outside"
android:id="@+id/outsideLight"
android:layout_marginTop="20dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="150dp"
android:layout_height="200dp"
android:layout_alignTop="@+id/linearLayout2"
android:layout_alignEnd="@+id/linearLayout"
android:id="@+id/linearLayout3">
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch1" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch2"
android:layout_marginTop="20dp" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch3"
android:layout_marginTop="20dp" />
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/switch4"
android:checked="false"
android:layout_marginTop="20dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="@string/backButton"
android:id="@+id/backButton"
android:layout_gravity="center_horizontal"
android:background="#010101"
android:textColor="#fefdfd"
android:textStyle="bold"
android:textSize="20dp" />
</LinearLayout>
LightingActivity.java 包裹 com.example.darren1.homemanagementsystem;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View.OnClickListener;
public class LightingActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setTitle("Light");
setContentView(R.layout.activity_lighting);
onClickListenerButton();
}
public void onClickListenerButton(){
Intent i = getIntent();
}
}
不正确:
setContentView(R.layout.activity_light);
-> activity_lighting.xml
不同的名字。
但是你有另一个不同的名字:
setContentView(R.layout.activity_main);
-> activity_mainn.xml
(可能是输入错误)
我猜问题出在这两行:
getActionBar().setTitle("Light");
setContentView(R.layout.activity_lighting);
你应该先放 setContentView()
,然后放 ActionBar
Title
If I were you I'd start using [
Toolbar](http://developer.android.com/reference/android/widget/Toolbar.html)
Do the
setTitle()` 如下:
ActionBar actionBar = getActionBar();
actionBar.setTitle("Light");
看到这个answer for more detail