android - 如何从文件资源管理器在我的应用程序中打开单个图像

Question

我正在开发一个应用程序，我想在该应用程序中从外部文件资源管理器打开我的应用程序中的任何照片。就像当我点击照片时，会出现选择应用程序窗口，然后我选择我的应用程序，图像就会显示在我的应用程序中。但是在这里，没有图像出现。

我在Manifest.xml中添加了代码:

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
        <activity
            android:name="com.image.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.EDIT" />

                <category android:name="android.intent.category.BROWSABLE" />
                <category android:name="android.intent.category.DEFAULT" />

                <data android:mimeType="image/*" />
                <data android:mimeType="text/*" />
            </intent-filter>
        </activity>
</application>

布局文件activity_main.xml

<RelativeLayout 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:padding="10dp"
    tools:context=".DataReceiverActivity" >

    <ImageView
        android:id="@+id/picture"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:contentDescription="Receive Picture Sharing" />

    <TextView
        android:id="@+id/txt"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</RelativeLayout>

在我的 MainActivity.java 中:

public class MainActivity extends Activity {

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

        ImageView picView = (ImageView) findViewById(R.id.picture);
        TextView txtView = (TextView) findViewById(R.id.txt);

        Intent receivedIntent = getIntent();
        String receivedAction = receivedIntent.getAction();
        String receivedType = receivedIntent.getType();

        // make sure it's an action and type we can handle
        if (receivedAction.equals(Intent.ACTION_SEND)) {
            if (receivedType.startsWith("text/")) {
                picView.setVisibility(View.GONE);
                String receivedText = receivedIntent
                    .getStringExtra(Intent.EXTRA_TEXT);
                if (receivedText != null) {
                    txtView.setText(receivedText);
                }
            } else if (receivedType.startsWith("image/")) {
                txtView.setVisibility(View.GONE);
                Uri receivedUri = (Uri) receivedIntent
                    .getParcelableExtra(Intent.EXTRA_STREAM);
                if (receivedUri != null) {
                    picView.setImageURI(receivedUri);// just for demonstration
                }
            }
        } else if (receivedAction.equals(Intent.ACTION_VIEW)) {

            if (receivedType.startsWith("text/")) {
                Toast.makeText(this, "TextRecived", Toast.LENGTH_SHORT).show();
                Uri uri2 = receivedIntent.getData();
                String uri = uri2.getEncodedPath() + "  complete: "
                    + uri2.toString();
                txtView.setText(uri);
            } else if (receivedType.startsWith("image/")) {

                txtView.setVisibility(View.GONE);
                Uri receivedUri = (Uri) receivedIntent
                    .getParcelableExtra(Intent.EXTRA_STREAM);
                Toast.makeText(this, receivedUri.toString(), Toast.LENGTH_SHORT).show();
                if (receivedUri != null) {
                    picView.setImageURI(receivedUri);// just for demonstration
                }
            }
        } else if (receivedAction.equals(Intent.ACTION_MAIN)) {
            txtView.setText("-----------------------------");
        }
    }

}

这是我的截图:

Answer 1

问题是您试图通过错误的方式获取 Uri。更改所有出现的

Uri receivedUri = (Uri) receivedIntent.getParcelableExtra(Intent.EXTRA_STREAM);

到

 Uri receivedUri = receivedIntent.getData();

这将为您提供文件的正确 Uri。还要注意 setImageURI 确实

Bitmap reading and decoding on the UI thread

引用this链接了解更多详情。