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[操作系统]Android 从Gallery获取图片


本文主要介绍Android中从Gallery获取图片

设计项目布局

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:onClick="selectImage"    android:text="选择一张照片" />  <ImageView    android:id="@+id/iv"    android:layout_width="fill_parent"    android:layout_height="fill_parent" /></LinearLayout>

打开packages\apps\Gallery下的清单文件,可以看到其中包含下面的代码:

 <activity android:name="com.android.camera.ImageGallery"        android:label="@string/gallery_label"        android:configChanges="orientation|keyboardHidden"        android:icon="@drawable/ic_launcher_gallery">      <intent-filter>        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.DEFAULT" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.VIEW" />        <category android:name="android.intent.category.DEFAULT" />        <data android:mimeType="vnd.android.cursor.dir/image" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.VIEW" />        <category android:name="android.intent.category.DEFAULT" />        <data android:mimeType="vnd.android.cursor.dir/video" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.GET_CONTENT" />        <category android:name="android.intent.category.OPENABLE" />        <data android:mimeType="vnd.android.cursor.dir/image" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.GET_CONTENT" />        <category android:name="android.intent.category.OPENABLE" />        <category android:name="android.intent.category.DEFAULT" />        <data android:mimeType="image/*" />        <data android:mimeType="video/*" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.PICK" />        <category android:name="android.intent.category.DEFAULT" />        <data android:mimeType="image/*" />        <data android:mimeType="video/*" />      </intent-filter>      <intent-filter>        <action android:name="android.intent.action.PICK" />        <category android:name="android.intent.category.DEFAULT" />        <data android:mimeType="vnd.android.cursor.dir/image" />      </intent-filter>    </activity>

逻辑部分代码如下:

public class MainActivity extends Activity {  private ImageView iv;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    iv = (ImageView) findViewById(R.id.iv);  }  public void selectImage(View view) {    // 激活系统图库的应用 选择一张照片    Intent intent = new Intent();    intent.setAction(intent.ACTION_PICK);    intent.setType("image/*");    startActivityForResult(intent, 0);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    if (data != null) {      Uri uri = data.getData(); // 图片的uri路径      iv.setImageURI(uri);    }    super.onActivityResult(requestCode, resultCode, data);  }}