Question

我正在尝试在我的应用中打开PDF文件。

我是通过在儿童活动中使用此代码来实现的：

        Intent addPDFIntent = new Intent();
        addPDFIntent.setType("*/*");
        addPDFIntent.setAction(Intent.ACTION_GET_CONTENT);
        addPDFIntent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(addPDFIntent, REQUEST_CODE);

这样可以让我转到我的文件浏览器并选择一个文件。但是，一旦我选择该文件，该程序将转到我的MainActivity（父）OnActivityResult，其resultCode为0，requestCode为0，data == null。

我期望它做什么（它没有做）是返回调用intent的onActivityResult（）方法的活动。我已经实现了（除了Log之外没有其他正文告诉我它是否已输入） - 但它从未进入此方法。它返回我的MainActivity而没有数据。

有人可以帮我理解为什么会这样吗？

EDIT2：此外，第二个活动是以StartActivityForResult开始的，但我从来没有在addPDF进程中调用finish（）。

编辑：根据要求，这是令人讨厌的课程。

public class PasteActivity extends Activity {
public static final String KEY_PASTE = "paste";
public static final String KEY_TEXT = "text";
public static final String TAG = "SPREE";
static final int REQUEST_CODE = 2;
private EditText mPasteField;
private Button mDoneButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_paste);
    Log.i("SPREE", "onCreated");

    mPasteField = (EditText) findViewById(R.id.pasteField);
    mDoneButton = (Button) findViewById(R.id.doneButton);
    textShared();
    final Intent returnToMain = new Intent(this, MainActivity.class);
    returnToMain.putExtra(KEY_PASTE, mPasteField.getText().toString()
            .trim());
    returnToMain.setAction(Intent.ACTION_DEFAULT);
    mDoneButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = getIntent();
            if (Intent.ACTION_SEND.equals(intent.getAction())) {
                startActivity(returnToMain);
            } else {                
            Intent data = new Intent();
            data.putExtra(KEY_PASTE, mPasteField.getText().toString()
                    .trim());
            setResult(RESULT_OK, data);
            finish();
            }
        }
    });

    Bundle received = getIntent().getExtras();
    String receievedString = received.getString(MainActivity.KEY_TO_READ);
    mPasteField.setText(receievedString);

    if (savedInstanceState != null) {
        // maintains typed text
        mPasteField.setText(savedInstanceState.getString(KEY_TEXT));
    }

}

void textShared() {
    Log.i("SREE", "textShared()");
    Intent intent = getIntent();
    String action = intent.getAction();
    String type = intent.getType();

    if (Intent.ACTION_SEND.equals(action) && type != null) {
        if ("text/plain".equals(type)) {
            handleSendText(intent);
        }
    }
}

void handleSendText(Intent intent) {
    String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT);
    if (sharedText != null)
        mPasteField.setText(sharedText);
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState
            .putString(KEY_TEXT, mPasteField.getText().toString());

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.paste, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
    case R.id.clearText:
        mPasteField.setText("");
        return true;
    case R.id.pasteText:
        ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
        if (clipboard.hasPrimaryClip()) {
            @SuppressWarnings("deprecation")
            String pasteText = clipboard.getText().toString();
            mPasteField.setText(pasteText);
        } else
            Toast.makeText(this, "Nothing to paste.", Toast.LENGTH_SHORT)
                    .show();
        return true;
    case R.id.addPDF:
        Intent addPDFIntent = new Intent();
        addPDFIntent.setType("*/*");
        addPDFIntent.setAction(Intent.ACTION_GET_CONTENT);
        addPDFIntent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(addPDFIntent, REQUEST_CODE);
        return true;
    default:
        return true;
    }

}
@Override
protected void onStart() {
    super.onStart();
    textShared();
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.i(TAG, "WORKS!");


}

Answer 1

像那样使用

startActivityForResult(addPDFIntent, 1);

完成数据选择功能后，使用返回意图方法

Intent resultIntent = new Intent();
    resultIntent.putExtra(PrevGross,your file);
    setResult(Activity.RESULT_OK, resultIntent);

以下代码在主类中使用..

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    if (resultCode == RESULT_OK)       
    {
        if (requestCode == 1) 
        {
            prevgross = data.getExtras().getstring(your content);       
        }}}

}我希望此代码可以帮助您的应用。

startActivityForResult返回错误的活动

1 个答案: