Question

我使用ShareActionProvider创建了一个分享图标。在MainActivity课程中，我有以下内容：

public class MainActivity extends AppCompatActivity{
 ....
 private ShareActionProvider mShareActionProvider;
 ...
 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);

        // Locate MenuItem with ShareActionProvider
        MenuItem item = menu.findItem(R.id.action_share);
        // Fetch and store ShareActionProvider
        mShareActionProvider =
                (ShareActionProvider) MenuItemCompat.getActionProvider(item);

        // call the intent
        setShareIntent();
        return true;
    }

    private void setShareIntent() {

        Intent myShareIntent = new Intent();
        myShareIntent.setAction(Intent.ACTION_SEND);
        myShareIntent.setType("text/plain");

        // get the content of the text view
        myShareIntent.putExtra(Intent.EXTRA_TEXT, myTextView.getText());

        mShareActionProvider.setShareIntent(myShareIntent);

    }

问题是myTextView的内容发生了变化，当用户点击共享图标时，默认文本会被共享。

我认为这是因为我们在onCreateOptionsMenu中调用了意图。如何更新意图，以便将当前内容存储在myTextView？

中

Answer 1

抓住Intent字段中的Activity，并在要共享的值发生变化时，在字段上调用putExtra()。

在this sample app中，我有一个EditText，并希望在用户输入内容时更新Intent个额外内容：

/***
  Copyright (c) 2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain   a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    https://commonsware.com/Android
 */

package com.commonsware.android.sap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.widget.EditText;
import android.widget.ShareActionProvider;
import android.widget.Toast;

public class MainActivity extends Activity implements
    ShareActionProvider.OnShareTargetSelectedListener, TextWatcher {
  private ShareActionProvider share=null;
  private Intent shareIntent=new Intent(Intent.ACTION_SEND);
  private EditText editor=null;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);

    shareIntent.setType("text/plain");
    editor=(EditText)findViewById(R.id.editor);
    editor.addTextChangedListener(this);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.actions, menu);

    share=
        (ShareActionProvider)menu.findItem(R.id.share)
                                 .getActionProvider();
    share.setOnShareTargetSelectedListener(this);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onShareTargetSelected(ShareActionProvider source,
                                       Intent intent) {
    Toast.makeText(this, intent.getComponent().toString(),
                   Toast.LENGTH_LONG).show();

    return(false);
  }

  @Override
  public void afterTextChanged(Editable s) {
    shareIntent.putExtra(Intent.EXTRA_TEXT, s.toString());
    share.setShareIntent(shareIntent);
  }

  @Override
  public void beforeTextChanged(CharSequence s, int start, int count,
                                int after) {
    // ignored
  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before,
                            int count) {
    // ignored
  }
}

我选择不仅更新额外内容，还要再次致电setShareIntent()。我不知道是否有必要。

Answer 2

您应该覆盖以下方法：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    //your code
}

然后在那里调用您的方法setShareIntent()。当然，如果您想在选项上点击触发该行为，如果您有其他按钮或其他内容，只需向其添加onClickListener即可。

更新Android中的共享意图内容

2 个答案: