Android：从文件管理器接收共享文本文件内容

Intent { act=android.intent.action.SEND cat=[android.intent.category.DEFAULT] typ=text/plain flg=0x1b080001 cmp=com.your.app/.MainActivity clip={text/plain U:content://com.android.providers.downloads.documents/document/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Fsample.txt} (has extras)

import android.content.Intent;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.TextView;
import android.net.Uri;
import android.content.ClipData;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "SharedTextReceiver";
    private TextView receivedTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); // 假设你有一个包含TextView的布局

        receivedTextView = findViewById(R.id.received_text_view); // 你的TextView ID

        handleIntent(getIntent());
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent); // 更新当前Activity的Intent
        handleIntent(intent);
    }

    private void handleIntent(Intent intent) {
        String action = intent.getAction();
        String type = intent.getType();

        if (Intent.ACTION_SEND.equals(action) && type != null) {
            if ("text/plain".equals(type)) {
                // 尝试从Intent的EXTRA_TEXT获取，通常用于直接共享文本
                String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT);
                if (sharedText != null) {
                    receivedTextView.setText("Received Text (EXTRA_TEXT):\n" + sharedText);
                    Log.d(TAG, "Received text from EXTRA_TEXT: " + sharedText);
                    return; // 如果已获取，则不再继续
                }

                // 如果EXTRA_TEXT为null，则尝试从ClipData获取，这通常是文件管理器共享文件的方式
                ClipData clipData = intent.getClipData();
                if (clipData != null && clipData.getItemCount() > 0) {
                    // 获取第一个ClipData.Item
                    ClipData.Item item = clipData.getItemAt(0);

                    // 使用coerceToText将item转换为CharSequence
                    // 注意：coerceToText需要一个Context来解析URI
                    CharSequence text = item.coerceToText(this); 
                    if (text != null) {
                        receivedTextView.setText("Received Text (ClipData):\n" + text.toString());
                        Log.d(TAG, "Received text from ClipData: " + text.toString());
                    } else {
                        receivedTextView.setText("Failed to coerce ClipData item to text.");
                        Log.e(TAG, "ClipData item could not be coerced to text.");
                    }
                } else {
                    receivedTextView.setText("No text or ClipData found in intent.");
                    Log.w(TAG, "No text or ClipData found in intent.");
                }
            } else {
                receivedTextView.setText("Unsupported MIME type: " + type);
                Log.w(TAG, "Unsupported MIME type: " + type);
            }
        } else {
            receivedTextView.setText("No ACTION_SEND intent received.");
            Log.d(TAG, "No ACTION_SEND intent received.");
        }
    }
}

<activity android:name=".MainActivity" android:exported="true">
    <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" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="text/plain" />
    </intent-filter>
</activity>