Question

很遗憾，应用已停止。我正在创建启动时的校友应用程序，该应用程序已停止。我已经研究了这个问题，并尝试更改清单文件中的代码。

MainActivity.java 包com.example.ashish.alumini.activities.pre_login;

  import android.graphics.Color;
  import android.os.Bundle;

  import android.app.TabActivity;
  import android.content.Intent;
  import android.util.Log;
  import android.util.TypedValue;
  import android.view.View;
  import android.widget.ProgressBar;
  import android.widget.TabHost;
  import android.widget.TextView;

  import com.example.ashish.alumini.R;
  import com.example.ashish.alumini.supporting_classes.GlobalBus;
  import com.example.ashish.alumini.supporting_classes.ProgressBarVisibility;
  import com.squareup.otto.Subscribe;

  import butterknife.Bind;
  import butterknife.ButterKnife;
  import me.zhanghai.android.materialprogressbar.IndeterminateHorizontalProgressDrawable;

 public class MainActivity extends TabActivity {
/** Called when the activity is first created. */

String TAG = getClass().getSimpleName();

@Bind(R.id.material_progressBar_activity_main)
ProgressBar mProgressBar;

GlobalBus mGlobalBus = GlobalBus.getInstance();

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

    // butterknife bindings
    ButterKnife.bind(this);

    //event mGlobalBus registering
    //        mGlobalBus.register(this);

    // setting progress bar
    mProgressBar.setIndeterminateDrawable(new IndeterminateHorizontalProgressDrawable(this));
    mProgressBar.setVisibility(View.INVISIBLE);

    TabHost tabHost = getTabHost();
    TabHost.TabSpec spec;

    Intent intent;

    intent = new Intent().setClass(this, Login.class);
    spec = tabHost.newTabSpec("Login").setIndicator("Login")
            .setContent(intent);
    tabHost.addTab(spec);


    intent = new Intent().setClass(this,SignUp.class);
    spec = tabHost.newTabSpec("Sign Up").setIndicator("Sign Up")
            .setContent(intent);
    tabHost.addTab(spec);


    for(int i=0;i<tabHost.getTabWidget().getChildCount();i++)
    {
        TextView tv = (TextView) tabHost.getTabWidget().getChildAt(i).findViewById(android.R.id.title);
        tv.setTextColor(Color.parseColor("#ffffff"));
        tv.setTextSize(TypedValue.COMPLEX_UNIT_SP,16);
    }

}


@Override
protected void onPause() {
    super.onPause();
      mGlobalBus.unregister(this);
}

@Override
protected void onResume() {
    super.onResume();
    mGlobalBus.register(this);

}
@Subscribe
public void hidePtogressBar(ProgressBarVisibility barVisibility){

    if (barVisibility.isVisibility()){
        mProgressBar.setVisibility(View.VISIBLE);
    }
    else {
        mProgressBar.setVisibility(View.INVISIBLE);
    }

    Log.d(TAG,"Bus Working");

}

}

AndroidManifest.xml

<?xml  version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ashish.alumini">


<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"     />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<uses-permission android:name="android.permission.SEND_SMS" />

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

    android:largeHeap="true"
    android:supportsRtl="true"
    android:name=".application.MyApplication"
    android:theme="@style/AppTheme">

    <activity
        android:name=".activities.pre_login.ActivitySplashScreen"
        android:label="Alumni">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


    <activity android:name=".activities.pre_login.Login"/>
    <activity android:name=".activities.pre_login.SignUp"/>
    <activity android:name=".activities.post_login.MainScreenActivity"
        android:windowSoftInputMode="stateHidden|adjustResize" />

    <activity android:name=".activities.post_login.PostLoginActivity"
        android:configChanges="orientation|keyboardHidden"
        android:windowSoftInputMode="stateHidden|adjustResize" />

    <activity android:name=".activities.pre_login.MainActivity"/>


    <meta-data android:name="AA_DB_NAME" android:value="alumni.db" />
    <meta-data android:name="AA_DB_VERSION" android:value="3" />
    <meta-data android:name="AA_MODELS" android:value="com.example.ashish.alumini.network.models.MemberInstanceModel,
    com.example.ashish.alumini.network.models.JobInstanceModel" />
    <meta-data
        android:name="io.fabric.ApiKey"
        android:value="ba6735ae3f3ef4ccc1dda75d84ceb6d3b06adbfe" />
</application>

Logcat：

09-15 23：08：07.219 17635-17635 / com.example.ashish.alumini E / dalvikvm：找不到类“ android.graphics.drawable.RippleDrawable”，从方法引用 android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering 09-15 23：08：12.089 17635-17635 / com.example.ashish.alumini E / AndroidRuntime：致命异常：main java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.ashish.alumini / com.example.ashish.alumini.activities.pre_login.MainActivity}： java.lang.NullPointerException 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2308）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2362）在android.app.ActivityThread.access $ 700（ActivityThread.java:168）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1329）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:176）在android.app.ActivityThread.main（ActivityThread.java:5493）在java.lang.reflect.Method.invokeNative（本机方法）在java.lang.reflect.Method.invoke（Method.java:525）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1225）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1041）在dalvik.system.NativeStart.main（本机方法）造成原因：java.lang.NullPointerException 在com.example.ashish.alumini.activities.pre_login.MainActivity.onCreate（MainActivity.java:47）在android.app.Activity.performCreate（Activity.java:5372）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1104）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2270）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2362）在android.app.ActivityThread.access $ 700（ActivityThread.java:168）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1329）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:176）在android.app.ActivityThread.main（ActivityThread.java:5493）在java.lang.reflect.Method.invokeNative（本机方法）在java.lang.reflect.Method.invoke（Method.java:525）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:12enter code here25）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1041）在dalvik.system.NativeStart.main（本机方法）

不幸的是，应用已停止-空指针异常

0 个答案: