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为什么我的应用在启动时崩溃（Android Studio）

androidandroid-layout
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我正在Android Studio IDE版本1.1.0上开发一款应用程序。

这是一个百分比应用程序...

我的问题是当我在设备上启动应用程序时，它会在启动时崩溃。

这是我的AndroidManifest.xml文件：

<?xml version="1.0" encoding="utf-8"?>


<application
    android:allowBackup="true"
    android:icon="@mipmap/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>

MainActivity.java

package com.ziad_homework.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends Activity {

TextView totalTextView;
EditText percentageTxt;
EditText numberTxt;

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

    totalTextView = (TextView) findViewById(R.id.totalTextView);
    percentageTxt = (EditText) findViewById(R.id.percentageTxt);
    numberTxt = (EditText) findViewById(R.id.numTxt);

    Button calcBtn = (Button) findViewById(R.id.calcBtn);
    calcBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view)
        {
            float percentage = Float.parseFloat(percentageTxt.getText().toString());
            float dec = percentage / 100;
            float total = dec * Float.parseFloat(numberTxt.getText().toString());
            totalTextView.setText(Float.toString(total));
        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.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();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content"
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">


<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="0"
    android:id="@+id/totalTextView"
    android:layout_marginTop="29dp"
    android:textStyle="normal"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentBottom="false"
    android:layout_alignParentLeft="false"
    android:layout_alignWithParentIfMissing="false"
    android:layout_alignParentRight="false"
    android:autoText="false"
    android:elegantTextHeight="false"
    android:gravity="center"
    android:textAlignment="center"
    android:textSize="50dp" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="What is"
    android:id="@+id/textView"
    android:layout_below="@+id/totalTextView"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="35dp" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="numberDecimal"
    android:ems="10"
    android:id="@+id/percentageTxt"
    android:layout_marginTop="28dp"
    android:hint="Enter Percentage"
    android:textAlignment="center"
    android:gravity="center"
    android:layout_below="@+id/textView"
    android:layout_centerHorizontal="true" />

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:inputType="numberDecimal"
    android:ems="10"
    android:id="@+id/numTxt"
    android:hint="Enter Number"
    android:textAlignment="center"
    android:gravity="center"
    android:layout_marginTop="18dp"
    android:layout_below="@+id/textView3"
    android:layout_toStartOf="@+id/textView2" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="%"
    android:id="@+id/textView2"
    android:layout_alignBottom="@+id/percentageTxt"
    android:layout_alignEnd="@+id/totalTextView"
    android:layout_marginEnd="25dp"
    android:layout_marginRight="55dp"
    android:layout_marginBottom="5dp"
    android:textSize="30dp" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="of"
    android:id="@+id/textView3"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="CALCULATE"
    android:id="@+id/calcBtn"
    android:layout_marginTop="39dp"
    android:background="#e8443e6f"
    android:textColor="#ffffff"
    android:gravity="center"
    android:layout_below="@+id/numTxt"
    android:layout_alignStart="@+id/numTxt"
    android:layout_alignEnd="@+id/numTxt" />
</RelativeLayout>

strings.xml

<resources>
<string name="app_name">Percent Calculator</string>

<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
</resources>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="primaryColor">#e8443e6f</color>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="android:Theme.Material.Light">
    <item name="android:colorPrimary">@color/primaryColor</item>
</style>

</resources>

日志记录：

     04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication E/Zygote﹕ MountEmulatedStorage()
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication E/Zygote﹕ v2
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication I/SELinux﹕ Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_SM-J105F_5.1.1_0046
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication E/SELinux﹕ [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication I/art﹕ Late-enabling -Xcheck:jni
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication E/art﹕ setrlimit(RLIMIT_CORE) failed for pid 20522: Operation not permitted
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication I/libpersona﹕ KNOX_SDCARD checking this for 10111
    04-30 14:53:23.541  20522-20522/com.ziad_homework.myapplication I/libpersona﹕ KNOX_SDCARD not a persona
    04-30 14:53:23.581  20522-20530/com.ziad_homework.myapplication E/art﹕ Failed sending reply to debugger: Broken pipe
    04-30 14:53:23.581  20522-20530/com.ziad_homework.myapplication I/art﹕ Debugger is no longer active
    04-30 14:53:23.611  20522-20522/com.ziad_homework.myapplication W/ResourcesManager﹕ getTopLevelResources: /data/app/com.ziad_homework.myapplication-2/base.apk / 1.0 running in com.ziad_homework.myapplication rsrc of package null
    04-30 14:53:23.641  20522-20522/com.ziad_homework.myapplication W/ResourcesManager﹕ getTopLevelResources: /data/app/com.ziad_homework.myapplication-2/base.apk / 1.0 running in com.ziad_homework.myapplication rsrc of package null
    04-30 14:53:23.651  20522-20522/com.ziad_homework.myapplication W/ResourcesManager﹕ getTopLevelResources: /data/app/com.ziad_homework.myapplication-2/base.apk / 1.0 running in com.ziad_homework.myapplication rsrc of package null
    04-30 14:53:23.661  20522-20522/com.ziad_homework.myapplication D/AndroidRuntime﹕ Shutting down VM
    04-30 14:53:23.661  20522-20522/com.ziad_homework.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
        Process: com.ziad_homework.myapplication, PID: 20522
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ziad_homework.myapplication/com.ziad_homework.myapplication.MainActivity}: java.lang.RuntimeException: A TaskDescription's primary color should be opaque
                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3150)
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260)
                at android.app.ActivityThread.access$1000(ActivityThread.java:218)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
                at android.os.Handler.dispatchMessage(Handler.java:102)
                at android.os.Looper.loop(Looper.java:145)
                at android.app.ActivityThread.main(ActivityThread.java:6934)
                at java.lang.reflect.Method.invoke(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:372)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
         Caused by: java.lang.RuntimeException: A TaskDescription's primary color should be opaque
                at android.app.ActivityManager$TaskDescription.<init>(ActivityManager.java:592)
                at android.app.Activity.onApplyThemeResource(Activity.java:4050)
                at 
android.view.ContextThemeWrapper.initializeTheme(ContextThemeWrapper.java:140)
                at android.view.ContextThemeWrapper.setTheme(ContextThemeWrapper.java:85)
                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3096)
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260)
                at android.app.ActivityThread.access$1000(ActivityThread.java:218)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
                at android.os.Handler.dispatchMessage(Handler.java:102)
                at android.os.Looper.loop(Looper.java:145)
                at android.app.ActivityThread.main(ActivityThread.java:6934)
                at java.lang.reflect.Method.invoke(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:372)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
    04-30 14:58:23.744  20522-20522/com.ziad_homework.myapplication I/Process﹕ Sending signal. PID: 20522 SIG: 9
你的 AppTheme 资源存在问题。你在那里使用了哪些自定义颜色？ - CommonsWare
我忘了提到我添加了一个colors.xml文件。 - Ziad
这是代码： <?xml version="1.0" encoding="utf-8"?> <resources> <color name="primaryColor">#e8443e6f</color> </resources> - Ziad
1个回答
1
您选择了一个半透明颜色（alpha通道为e8）。一般来说，这可能存在风险，因为您不知道背后的颜色是什么，这会因设备而异。显然，安卓本身也不喜欢这个，根据您的错误消息。将其更改为ff，使整体颜色为ff443e6f，看看是否解决了问题。
它已经解决了颜色问题，但我认为在onClickListner上有问题...抱歉，我对Android Studio还不太熟悉。Caused by: java.lang.NullPointerException: 尝试在空对象引用上调用虚拟方法'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' at com.ziad_homework.myapplication.MainActivity.onCreate(MainActivity.java:27) - Ziad
1
@Ziad：由于某些原因，findViewById()无法找到你的calcBtn。我不知道为什么。 - CommonsWare
好的，我找到问题了...我太傻了。 我忘记了我改变了代码来调试错误，所以当我恢复它时，它完美地工作了。 非常感谢！ - Ziad
问题似乎有所不同。应用程序在“运行”模式下运行良好，在“调试”模式下崩溃。需要检查设备工作室配置。请改进答案。 - Prasad G Kulkarni
@PrasadGKulkarni：我建议您提出自己的问题，其中包括您自己的[mcve]、您自己的Java堆栈跟踪和您自己触发崩溃的解释。 - CommonsWare
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