java 简单的 android 应用程序在启动时崩溃
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Simple android app crashes on startup
提问by antoninkriz
I am creating a new Android app, but it crashes on startup (phone and emulator).
我正在创建一个新的 Android 应用程序，但它在启动时崩溃（电话和模拟器）。
Here is the code:
这是代码：
Arcig Manifest.xml
Arcig Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tona.arcig"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="17" /><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>
</application>
Strings.xml
字符串文件
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="suplovani">Suplování</string>
<string name="rozvrh">Rozvrh hodin</string>
<string name="prihlasovani">P?ihla?ování do systému</string>
<string name="email">Email</string>
<string name="moodle">Moodle</string>
<string name="kdm">KDM</string>
<string name="o_aplikaci">O Aplikaci</string>
<string name="app_name">Arcig.CZ</string>
</resources>
activity_main.xml
活动_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/suplovani"
android:src="@drawable/suplovani" />
<ImageButton
android:id="@+id/imageButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/rozvrh"
android:src="@drawable/rozvrh" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/imageButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/prihlasovani"
android:src="@drawable/prihlasovani" />
<ImageButton
android:id="@+id/imageButton4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/email"
android:src="@drawable/email" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageButton
android:id="@+id/imageButton5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/email"
android:src="@drawable/moodle" />
<ImageButton
android:id="@+id/imageButton6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:contentDescription="@string/kdm"
android:src="@drawable/jidelna" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageButton
android:id="@+id/imageButton7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/o_aplikaci"
android:src="@drawable/about" />
</LinearLayout>
</LinearLayout>
MainActivity.java
主活动.java
package com.tona.arcig;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
public void addListenerOnButton() {
Button button = (Button) findViewById(R.id.imageButton1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Do something in response to button click
Toast.makeText(getApplicationContext(), "Mam rad vlaky", Toast.LENGTH_LONG).show();
}
});
}
}
CONSOLE
安慰
[2014-09-07 16:39:21 - Arcig] ------------------------------
[2014-09-07 16:39:21 - Arcig] Android Launch!
[2014-09-07 16:39:21 - Arcig] adb is running normally.
[2014-09-07 16:39:21 - Arcig] Performing com.tona.arcig.MainActivity activity launch
[2014-09-07 16:39:21 - Arcig] Automatic Target Mode: Unable to detect device compatibility. Please select a target device.
[2014-09-07 16:39:23 - Arcig] Application already deployed. No need to reinstall.
[2014-09-07 16:39:23 - Arcig] Starting activity com.tona.arcig.MainActivity on device 0123456789ABCDEFG
[2014-09-07 16:39:24 - Arcig] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.tona.arcig/.MainActivity }
When I execute the app, it just shows a crash message. :( Can anybody help me? Have I made any mistakes in the code? Thanks a lot guys
当我执行应用程序时，它只显示一条崩溃消息。:(有人可以帮助我吗？我在代码中犯了任何错误吗？非常感谢你们
回答by laalto
<ImageButton
android:id="@+id/imageButton1"
and
和
Button button = (Button) findViewById(R.id.imageButton1);
ImageButtonis not a Buttonso this causes ClassCastExceptionyou would have seen in your logcat if you had included it in the question. (Hint: Always start crash-solving with the stacktrace in logcat.)
ImageButton不是，Button所以ClassCastException如果您将它包含在问题中，这会导致您在 logcat 中看到它。（提示：始终使用 logcat 中的堆栈跟踪开始解决崩溃问题。）
Change the latter part to
将后半部分改为
ImageButton button = (ImageButton) findViewById(R.id.imageButton1);
回答by Panda1667075
I can see you are using ImageButton. I guess, the drawable images source size are more. If the images size are more android app will crash. Please try to keep your individual image size as low as possible. May be with in 50-60KB per image.
我可以看到您正在使用 ImageButton。我想，可绘制的图像源大小更多。如果图像大小更大 android 应用程序将崩溃。请尽量保持您的个人图像尺寸尽可能小。每个图像可能有 50-60KB。
