我一直在四处寻找,似乎无法找到答案。我的Android应用程序编译正确,没有错误或任何东西,它安装正确,但它不会出现在应用程序抽屉中,并且"打开"按钮显示为灰色。这是我的主要活动
package com.dogger20011.app;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new
PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
if (id == R.id.Downloads) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
有什么想法吗?谢谢!
答案 0 :(得分:2)
您将主要活动放置在意图过滤器之后,该过滤器将mainActivity作为启动器。请更正下面的XML(基本上,MainActivitiy
相关内容)并删除maxSDKVersion
Uses-permission
标记
最后它应该是这样的:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dogger20011.app"
android:versionCode="1"
android:versionName="1.0.5" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name">
<activity
android:name="com.dogger20011.app.MainActivity"
android:label="@string/app_name"/>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
<activity
android:label="@string/app_name"
android:name=".AppActivity"/>
<activity
android:label="@string/app_name"
android:name=".AppActivity_modD"/>
<activity
android:label="@string/app_name"
android:name=".App2Activity"/>
<activity
android:label="@string/app_name"
android:name=".AppActivity_ModD2"/>
</application>
</manifest>
答案 1 :(得分:0)
你的MainActivity不应该有所作为,这完全取决于清单。您的主要活动块应如下所示:
<activity
android:name="com.dogger20011.app.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>
请注意,<intent-filter>
块需要嵌套在<{strong> <activity>
块中。