为什么我的应用程序在启动时崩溃（Android Studio）

我正在Android Studio IDE 1.1.0版上开发应用程序。这是个应用程序...为什么我的应用程序在启动时崩溃（Android Studio）

我的问题是，当我开始它一直在启动时崩溃的设备上的应用程序。

这里是我的AndroidManifest.xml

<?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中

<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>

的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>

styles.xml（V21）

<?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>

的logcat的：

 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

来源

2016-04-30 Ziad

您的AppTheme资源存在问题。你在那里使用哪些自定义颜色？ – CommonsWare

我忘了提及，我添加了一个colors.xml文件 – Ziad

这 <？XML版本= “1.0” 编码= “UTF-8”？> <颜色名= “primaryColor”>＃e8443e6f – Ziad

您选择了半透明的颜色（alpha通道为e8）。一般来说，这将是有风险的，因为您不知道背后有什么颜色，因为它会因设备而异。而且，显然Android本身并不喜欢这个，因为你的错误信息。将其更改为ff，使总体颜色为ff443e6f，然后查看是否清除了您的问题。

来源

2016-04-30 14:55:52 CommonsWare

它已清除颜色问题但我认为我在onClickListner中有问题我认为...对不起，我对Android Studio有点新引起：java.lang.NullPointerException：尝试调用虚方法void android.widget.Button.setOnClickListener（android.view.View $ OnClickListener）'null对象引用 at com.ziad_homework.myapplication.MainActivity.onCreate（MainActivity.java:27） – Ziad

@Ziad：出于某种原因，findViewBy Id（）'找不到'calcBtn'。我不知道为什么。 – CommonsWare

感谢您的时间。 – Ziad

为什么我的应用程序在启动时崩溃（Android Studio）

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