小编Bao*_* Le的帖子

我从XML创建一个RadioGroup

    <RadioGroup android:id="@+id/option" 
        android:layout_width="match_parent"
        android:orientation="horizontal" 
        android:checkedButton="@+id/block_scenario_off"
        android:layout_height="wrap_content">
        <RadioButton 
            android:layout_width="0dip"
            android:layout_weight="1" 
            android:text="@string/option1" 
            android:layout_height="wrap_content" 
            android:id="@+id/option1"
            android:layout_gravity="center|left" 
            android:onClick="@string/on_click"/>
        <RadioButton 
            android:layout_width="0dip"
            android:layout_weight="1" 
            android:text="@string/option2" 
            android:onClick="@string/on_click"
            android:layout_height="wrap_content"
            android:layout_gravity="center" 
            android:id="@+id/option2"/>
        <RadioButton 
            android:layout_width="0dip"
            android:layout_weight="1" 
            android:text="@string/option3"
            android:onClick="@string/on_click" 
            android:layout_height="wrap_content"
            android:layout_gravity="center|right" 
            android:id="@+id/option3" />
    </RadioGroup>

在Java代码中,我以编程方式检查有关活动创建的第一个(onCreate()),如下所示:

    mOption = (RadioGroup) findViewById(R.id.option);
    mOption.check(R.id.option1);

但是当显示活动时,不会检查单选按钮.有帮助吗？

我写了一个试图修改电话呼叫状态的应用程序.它在Android 2.2或更低版本上运行良好,但在Android 2.3上抛出异常,因为缺少对android.permission.MODIFY_PHONE_STATE权限的许可(我在AndroidManifest.xml上声明了此权限).任何的想法？以下是异常日志:

01-15 09:14:23.210: ERROR/AndroidRuntime(404): FATAL EXCEPTION: main
01-15 09:14:23.210: ERROR/AndroidRuntime(404): java.lang.RuntimeException: Unable to start receiver test.PhoneReceiver: java.lang.SecurityException: Neither user 10031 nor current process has android.permission.MODIFY_PHONE_STATE.
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:1780)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.app.ActivityThread.access$2400(ActivityThread.java:117)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:978)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.os.Looper.loop(Looper.java:123)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at android.app.ActivityThread.main(ActivityThread.java:3647)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at java.lang.reflect.Method.invokeNative(Native Method)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at java.lang.reflect.Method.invoke(Method.java:507)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-15 09:14:23.210: ERROR/AndroidRuntime(404):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-15 09:14:23.210: …

我有一个使用Gradle和Android Studio的库和Android应用程序.我可以将库直接包含在项目中,如下所示

compile project(':library')

因为我不想与库源代码相结合,所以我想将库发布到本地存储库中,以便我可以使用as

compile 'com.mygroup:library:1.0'

有什么建议吗？

我是Polymer的新手.我开始编写一个简单的webapp,其中1.用户首先登陆登录页面2.如果用户通过登录,则将用户引导至内容页面

我写了一个元素"登录"

<dom-module id="login">
  <template>
    <!-- local DOM for your element -->
    <p>Username</p>
    <input class="paper-font-body2" value="{{email::change}}" type="email">
    <br/>
    <p>Password</p>
    <input class="paper-font-body2" value="{{password::change}}" type="password">
    <p>{{errorMessage}}</p>

    <iron-ajax
      id="ajax"
      url=""
      method="POST"
      on-response="signInResponse"
      debounce-duration="300">
    </iron-ajax>

    <button on-click="signIn">Signin</button>
  </template>
</dom-module>

<script>
  // element registration
  Polymer({
    is: "login",

    // add properties and methods on the element's prototype
    properties: {
      // declare properties for the element's public API
      email: {
        type: String,
        value: "username"
      },
      password: {
        type: String,
        value: "password"
      },
      errorMessage: {
        type: String,
        value: …

我使用BroadcastReceiver拦截Android手机上的来电,如下所示

tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
Bundle bundle = intent.getExtras();
String number = bundle.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);

在"私人号码"的情况下,我在两个设备上进行了测试,它在HTC Wildfire上显示数字为-1,在Galaxy S上显示为-2.我检查过android.telephony.PhoneNumberUtils但它无法帮助我.

是否有功能或通用方法来检测Android手机上的私人号码？

如何以编程方式读取linux文件权限,而不是使用"ls"然后解析结果.

我有一个项目列表,其中每个项目的.content html值如下所示.

  <template is="dom-repeat" items="{{entries}}">
    <li><p class="paper-font-body2">{{item.title}}</p>
      <div>{{item.content}}</div></li>
  </template>

内容字段有点像这样

  Hello <strong>Polymer</strong>

它在浏览器中显示为纯文本.如何将其显示为安全的HTML？

编辑:这个问题被提出,但它没有帮助我.

我为我的应用程序使用Android 音效/均衡器API.但是,它限制为5个频段.是否有任何文档/库有助于调整更多频段以实现更精细的均衡器实现？

最新的Android SDK(R22)已删除android.renderscript.RSSurfaceView和android.renderscript.RenderScriptGL类.我们如何在SurfaceView或常规Android View上直接使用RenderScript？

我正在写一个音频播放器,音频时间很短(通常为1-5秒),如下所示

//start media player
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(context, Uri.fromFile(audioCache));
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setOnCompletionListener(new         MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mediaPlayer) {
        stopPlaying(true);
    }
});
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {
        mediaPlayer.start();
        startPlayingTimer();
    }
});
mediaPlayer.prepareAsync();


int UI_UPDATE_FREQ = 1000/ 60 + 1;

private void startPlayingTimer() {
    playerRunnable = new Runnable() {
        @Override
        public void run() {
            uiHandler.post(updateWaveRunnable);
            handler.postDelayed(this, UI_UPDATE_FREQ);
        }
    };
    handler.postDelayed(playerRunnable, UI_UPDATE_FREQ);

}

Runnable updateWaveRunnable = new Runnable() {
    @Override
    public void run() {
            int position = …

我迁移到Android studio 3并使用gradle插件v3.0.0-beta6.我想重写输出.apk文件的versionName/vesionCode.我在Android应用模块的build.gradle中使用了以下代码来获取gradle插件2.x.

applicationVariants.all { variant ->
    def flavor = variant.mergedFlavor

    flavor.versionName="${VERSION_NAME}"
    if (variant.buildType.isDebuggable()) {
        flavor.versionCode=9999
    } else {
        flavor.versionCode=Integer.parseInt(gitCommitCount)
    }
}

它不适用于gradle插件v3.0.0-beta6.对于versionCode,我使用此Gradle 3.0.0 alpha变体输出问题中的解决方案成功重写了它

当我尝试将文件(图像,音频)上传到S3时偶尔会遇到此异常.这有什么解决方案吗？

配置:Android 4x,5x,aws-android-sdk-s3 2.2.14版.

Unable to execute HTTP request: Write error: ssl=0x9ab52680: I/O error during system call, Connection reset by peer
javax.net.ssl.SSLException: Write error: ssl=0x9ab52680: I/O error during system call, Connection reset by peer
    at com.android.org.conscrypt.NativeCrypto.SSL_write(Native Method)
    at com.android.org.conscrypt.OpenSSLSocketImpl$SSLOutputStream.write(OpenSSLSocketImpl.java:766)
    at com.android.okhttp.okio.Okio$1.write(Okio.java:76)
    at com.android.okhttp.okio.AsyncTimeout$1.write(AsyncTimeout.java:155)
    at com.android.okhttp.okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.java:176)
    at com.android.okhttp.okio.RealBufferedSink.write(RealBufferedSink.java:46)
    at com.android.okhttp.internal.http.HttpConnection$FixedLengthSink.write(HttpConnection.java:302)
    at com.android.okhttp.okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.java:176)
    at com.android.okhttp.okio.RealBufferedSink$1.write(RealBufferedSink.java:198)
    at com.amazonaws.http.UrlHttpClient.write(UrlHttpClient.java:172)
    at com.amazonaws.http.UrlHttpClient.writeContentToConnection(UrlHttpClient.java:129)
    at com.amazonaws.http.UrlHttpClient.execute(UrlHttpClient.java:65)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:360)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:199)
    at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4221)
    at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1628)
    at net.tandem.ext.aws.AmazonUtil.uploadFile(AmazonUtil.java:131)
    at net.tandem.ext.aws.AmazonUtil.uploadFile(AmazonUtil.java:65)
    at net.tandem.service.MessageService$2.doInBackground(MessageService.java:323)
    at net.tandem.service.MessageService$2.doInBackground(MessageService.java:315)
    at android.os.AsyncTask$2.call(AsyncTask.java:295)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at …

我会创建一个宽度为70%的视图,并使用约束布局对齐其父级的右侧,如下所示

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <android.support.constraint.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.3"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="Hello text"
        app:layout_constraintLeft_toRightOf="@+id/guideline"
        app:layout_constraintRight_toRightOf="parent"/>

</android.support.constraint.ConstraintLayout>

TextView始终占用完整的父宽度.知道我做错了什么吗？