如果主要活动不是MainActivity，Android应用程序会崩溃

Question

我想从加载视图开始，但是当我打开它时总是崩溃，如果AndroidManifiest.xml中的主要活动不是MainActivity。在模拟器上很好，但问题只是在手机中安装apk时。有什么帮助吗？

AndroidManifiest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.daniel.jaentodayapp">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label=""
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.NoActionBar">
    </activity>
    <activity
        android:name=".LoadingScreen"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

LoadingScreen

public class LoadingScreen extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_loading_screen);
    new Thread(new Runnable() {
        public void run() {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                Intent intent = new Intent(LoadingScreen.this, MainActivity.class);
                startActivity(intent);
            }
        }
    }).start();
}

@Override
protected void onPause() {
    super.onPause();
    finish();
}}

布局加载屏幕

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_loading_screen"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.daniel.jaentodayapp.LoadingScreen">
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/pcarga"></LinearLayout></RelativeLayout>

这是错误：

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.example.daniel.jaentodayapp, PID: 18967
              java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.daniel.jaentodayapp/com.example.daniel.jaentodayapp.LoadingScreen}: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class <unknown>
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                  at android.app.ActivityThread.access$900(ActivityThread.java:150)
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:148)
                  at android.app.ActivityThread.main(ActivityThread.java:5417)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
               Caused by: android.view.InflateException: Binary XML file line #9: Binary XML file line #9: Error inflating class <unknown>
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
                  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
                  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
                  at com.example.daniel.jaentodayapp.LoadingScreen.onCreate(LoadingScreen.java:13)
                  at android.app.Activity.performCreate(Activity.java:6285)
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                  at android.app.ActivityThread.access$900(ActivityThread.java:150) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
               Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class <unknown>
                  at android.view.LayoutInflater.createView(LayoutInflater.java:645)
                  at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)
                  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694)
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762)
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
                  at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
                  at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
                  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) 
                  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
                  at com.example.daniel.jaentodayapp.LoadingScreen.onCreate(LoadingScreen.java:13) 
                  at android.app.Activity.performCreate(Activity.java:6285) 
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) 
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                  at android.app.ActivityThread.access$900(ActivityThread.java:150) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
               Caused by: java.lang.reflect.InvocationTargetException
                  at java.lang.reflect.Constructor.newInstance(Native Method)
                  at android.view.LayoutInflater.createView(LayoutInflater.java:619)
                  at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58) 
                  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694) 
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762) 
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 
                  at android.view.LayoutInflater.rInflate(LayoutInflater.java:835) 
                  at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
                  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) 
                  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
                  at com.example.daniel.jaentodayapp.LoadingScreen.onCreate(LoadingScreen.java:13) 
                  at android.app.Activity.performCreate(Activity.java:6285) 
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) 
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                  at android.app.ActivityThread.access$900(ActivityThread.java:150) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
               Caused by: java.lang.OutOfMemoryError: Failed to allocate a 255322380 byte allocation with 12571568 free bytes and 126MB until OOM
                  at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
                  at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
                  at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609)
                  at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
                  at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1080)
                  at android.content.res.Resources.loadDrawableForCookie(Resources.java:2635)
                  at android.content.res.Resources.loadDrawable(Resources.java:2540)
                  at android.content.res.TypedArray.getDrawable(TypedArray.java:870)
                  at android.view.View.<init>(View.java:3955)
                  at android.view.ViewGroup.<init>(ViewGroup.java:574)
                  at android.widget.LinearLayout.<init>(LinearLayout.java:203)
                  at android.widget.LinearLayout.<init>(LinearLayout.java:199)
                  at android.widget.LinearLayout.<init>(LinearLayout.java:195)
                  at java.lang.reflect.Constructor.newInstance(Native Method) 
                  at android.view.LayoutInflater.createView(LayoutInflater.java:619) 
                  at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58) 
                  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694) 
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762) 
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 
                  at android.view.LayoutInflater.rInflate(LayoutInflater.java:835) 
                  at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
                  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) 
                  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
                  at com.example.daniel.jaentodayapp.LoadingScreen.onCreate(LoadingScreen.java:13) 
                  at android.app.Activity.performCreate(Activity.java:6285) 
                  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) 
                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                  at android.app.ActivityThread.access$900(ActivityThread.java:150) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 

Answer 1

您只能从主线程调用startActivity()。如果您想使用Runnable拨打电话Handler如果您拨打.run()而不是.start()，则可以在主叫线程上执行runnable

Answer 2

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

@Override
protected void onResume() {
    super.onResume();
    Intent intent = new Intent(LoadingScreen.this, MainActivity.class);
    startActivity(intent);
    finish();
}

  

除非必要，否则永远不要在加载屏幕中放置等待计时器，调用onResume中的MainActvity，因为在调用onResume时，Sytem完成加载App的操作。

关于如何以良好的方式实现启动画面（载入画面）的堆栈溢出有很多例子。同时你可以使用这个解决方案

Answer 3

您可以尝试：

private final Handler mHandler = new Handler();

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

    mHandler.postDelayed(moveToMain, 3000);
}

private final Runnable moveToMain = new Runnable() {
    public void run() {
        startActivity(new Intent(LoadingScreen.this, MainActivity.class));
        finish();
    }
};

Answer 4

new Handler().postDelayed(new Runnable() {
  @Override
  public void run() {
    try {
       Intent intent = new Intent(LoadingScreen.this,MainActivity.class);
       startActivity(intent);
       finish();
     } catch (Exception e) {
        e.printStackTrace();
     }
    }
        }, 3000);

请在开始新活动时完成您的活动。 而不是完成暂停（） 这是在主线程上运行UIThread的问题。 希望回答这个问题。
如果您粘贴或显示堆栈跟踪或错误日志，则可以更轻松地找到解决方案。

由于