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 xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="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);

    }

}