如何传递 Intent Extras?

发布于 11-25 10:52 字数 5267 浏览 1 评论 0原文

     public class Menus extends Activity {
//set constants for MediaStore to query, and show videos
private final static Uri MEDIA_EXTERNAL_CONTENT_URI = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
private final static String _ID = MediaStore.Video.Media._ID;
private final static String MEDIA_DATA = MediaStore.Video.Media.DATA;
//flag for which one is used for images selection
private GridView _gallery; 
private Cursor _cursor;
private int _columnIndex;
private int[] _videosId;
private Uri _contentUri;


protected Context _context;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    _context = getApplicationContext();
    _gallery = (GridView) findViewById(R.id.videoGrdVw);
    //set default as external/sdcard uri
    _contentUri = MEDIA_EXTERNAL_CONTENT_URI;
    //initialize the videos uri 
    //showToast(_contentUri.getPath());
    initVideosId();
    //set gallery adapter
    setGalleryAdapter();
}
private void setGalleryAdapter() {
    _gallery.setAdapter(new VideoGalleryAdapter(_context));
    _gallery.setOnItemClickListener(_itemClickLis);

}
private AdapterView.OnItemClickListener _itemClickLis = new OnItemClickListener() 
{
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) 
    {
        // Now we want to actually get the data location of the file
        String [] proj={MEDIA_DATA};
        // We request our cursor again
        _cursor = managedQuery(_contentUri,
                proj, // Which columns to return
                null,       // WHERE clause; which rows to return (all rows)
                null,       // WHERE clause selection arguments (none)
                null); // Order-by clause (ascending by name)
        // We want to get the column index for the data uri
        int count = _cursor.getCount();
        //
        _cursor.moveToFirst();
        //
        _columnIndex = _cursor.getColumnIndex(MEDIA_DATA);
        // Lets move to the selected item in the cursor
        _cursor.moveToPosition(position);

        Intent i = new Intent();
        i.putExtra("mnt/sdcard-ext", _ID);
        startActivity("com.ave.EDITOR");


    }
};

以上是我的第二个活动的一部分。基本上,此代码显示手机 SD 卡中的视频缩略图。无论如何,当我单击缩略图时,我希望单击列表中的项目以打开下面发布的新活动,即 ViewView。

public class Editor extends Activity {

ImageButton video1;
int isClicked = 0;
ImageButton audio;
int isClicked1 = 0;
private String path = "mnt/sdcard-ext";
private VideoView mVideoView;

    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    getWindow().setFormat(PixelFormat.TRANSLUCENT);
    setContentView(R.layout.editor);
    mVideoView = (VideoView) findViewById(R.id.videoView);

    int data = getIntent().getExtras("mnt/sdcard-ext") .getInt("com.ave.EDITOR");

    if (path == "mnt/sdcard-ext") {
        // Tell the user to provide a media file URL/path.
        Toast.makeText(
                Editor.this,
                "Please edit VideoViewDemo Activity, and set path"
                        + " variable to your media file URL/path",
                Toast.LENGTH_LONG).show();

    } else {

        /*
         * Alternatively,for streaming media you can use
         * mVideoView.setVideoURI(Uri.parse(URLstring));
         */
        mVideoView.setVideoPath(path);
        mVideoView.setMediaController(new MediaController(this));
        mVideoView.requestFocus();



    video1 = (ImageButton) findViewById(R.id.video1);
    video1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            if (isClicked == 0) {
                video1.setImageResource(R.drawable.video_pressed);
                isClicked = 1;
            } else {
                video1.setImageResource(R.drawable.video1);
                isClicked = 0;
            }
          }
     });

    audio = (ImageButton) findViewById(R.id.audio);
    audio.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            if (isClicked1 == 0) {
                audio.setImageResource(R.drawable.audio_pressed);
                isClicked1 = 1;
            } else {
                audio.setImageResource(R.drawable.audio);
                isClicked1 = 0;
            }
          }
      });
    }
  }
}

正如您所看到的,我不知道如何正确传递意图附加内容,也不知道如何从第三个活动中获取它们。感谢所有帮助。谢谢。

====== Android Manifest ====== (这不是完整的清单文件)

<activity android:name=".Menus" android:label="@string/app_name" android:screenOrientation="landscape" >
      <intent-filter>
            <action android:name="com.ave.CLEARSCREEN" />
            <category android:name="android.intent.category.DEFAULT" />
      </intent-filter>
</activity>
<activity android:name=".Editor" android:screenOrientation="landscape" >
      <intent-filter>
            <action android:name="com.ave.EDITOR" />
            <category android:name="android.intent.category.DEFAULT" />
      </intent-filter>
</activity>
</application>
</manifest>
     public class Menus extends Activity {
//set constants for MediaStore to query, and show videos
private final static Uri MEDIA_EXTERNAL_CONTENT_URI = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
private final static String _ID = MediaStore.Video.Media._ID;
private final static String MEDIA_DATA = MediaStore.Video.Media.DATA;
//flag for which one is used for images selection
private GridView _gallery; 
private Cursor _cursor;
private int _columnIndex;
private int[] _videosId;
private Uri _contentUri;


protected Context _context;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    _context = getApplicationContext();
    _gallery = (GridView) findViewById(R.id.videoGrdVw);
    //set default as external/sdcard uri
    _contentUri = MEDIA_EXTERNAL_CONTENT_URI;
    //initialize the videos uri 
    //showToast(_contentUri.getPath());
    initVideosId();
    //set gallery adapter
    setGalleryAdapter();
}
private void setGalleryAdapter() {
    _gallery.setAdapter(new VideoGalleryAdapter(_context));
    _gallery.setOnItemClickListener(_itemClickLis);

}
private AdapterView.OnItemClickListener _itemClickLis = new OnItemClickListener() 
{
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) 
    {
        // Now we want to actually get the data location of the file
        String [] proj={MEDIA_DATA};
        // We request our cursor again
        _cursor = managedQuery(_contentUri,
                proj, // Which columns to return
                null,       // WHERE clause; which rows to return (all rows)
                null,       // WHERE clause selection arguments (none)
                null); // Order-by clause (ascending by name)
        // We want to get the column index for the data uri
        int count = _cursor.getCount();
        //
        _cursor.moveToFirst();
        //
        _columnIndex = _cursor.getColumnIndex(MEDIA_DATA);
        // Lets move to the selected item in the cursor
        _cursor.moveToPosition(position);

        Intent i = new Intent();
        i.putExtra("mnt/sdcard-ext", _ID);
        startActivity("com.ave.EDITOR");


    }
};

The Above is part of my Second Activity. Basically This code Displays Video Thumbnails from the SD card of the phone. Anyways, When i click on a thumbnail i want the Item in the list clicked to open to a new activity posted below, which is a ViewView.

public class Editor extends Activity {

ImageButton video1;
int isClicked = 0;
ImageButton audio;
int isClicked1 = 0;
private String path = "mnt/sdcard-ext";
private VideoView mVideoView;

    @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    getWindow().setFormat(PixelFormat.TRANSLUCENT);
    setContentView(R.layout.editor);
    mVideoView = (VideoView) findViewById(R.id.videoView);

    int data = getIntent().getExtras("mnt/sdcard-ext") .getInt("com.ave.EDITOR");

    if (path == "mnt/sdcard-ext") {
        // Tell the user to provide a media file URL/path.
        Toast.makeText(
                Editor.this,
                "Please edit VideoViewDemo Activity, and set path"
                        + " variable to your media file URL/path",
                Toast.LENGTH_LONG).show();

    } else {

        /*
         * Alternatively,for streaming media you can use
         * mVideoView.setVideoURI(Uri.parse(URLstring));
         */
        mVideoView.setVideoPath(path);
        mVideoView.setMediaController(new MediaController(this));
        mVideoView.requestFocus();



    video1 = (ImageButton) findViewById(R.id.video1);
    video1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            if (isClicked == 0) {
                video1.setImageResource(R.drawable.video_pressed);
                isClicked = 1;
            } else {
                video1.setImageResource(R.drawable.video1);
                isClicked = 0;
            }
          }
     });

    audio = (ImageButton) findViewById(R.id.audio);
    audio.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            if (isClicked1 == 0) {
                audio.setImageResource(R.drawable.audio_pressed);
                isClicked1 = 1;
            } else {
                audio.setImageResource(R.drawable.audio);
                isClicked1 = 0;
            }
          }
      });
    }
  }
}

As you can see I don't know how to properly pass the intent extras, nor do i know how to get them from the 3rd activity. All help is appreciated. Thank you.

====== Android Manifest ====== (This is not the full manifest file)

<activity android:name=".Menus" android:label="@string/app_name" android:screenOrientation="landscape" >
      <intent-filter>
            <action android:name="com.ave.CLEARSCREEN" />
            <category android:name="android.intent.category.DEFAULT" />
      </intent-filter>
</activity>
<activity android:name=".Editor" android:screenOrientation="landscape" >
      <intent-filter>
            <action android:name="com.ave.EDITOR" />
            <category android:name="android.intent.category.DEFAULT" />
      </intent-filter>
</activity>
</application>
</manifest>

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评论(3

情话墙2024-12-02 10:52:34
Intent i = new Intent("com.ave.EDITOR");
i.putExtra("mnt/sdcard-ext", _ID);
startActivity(i);

onCreate 方法的第二个活动中:

String data = getIntent().getStringExtra("mnt/sdcard-ext");
Intent i = new Intent("com.ave.EDITOR");
i.putExtra("mnt/sdcard-ext", _ID);
startActivity(i);

and in second activity in onCreate method:

String data = getIntent().getStringExtra("mnt/sdcard-ext");
辞别2024-12-02 10:52:34

试试这个:int data = getIntent().getExtras() .getInt("mnt/sdcard-ext");

Try this: int data = getIntent().getExtras() .getInt("mnt/sdcard-ext");

寄离2024-12-02 10:52:34

您需要对传递给 startActivity() 的 Intent 实例调用 putExtra()。在第二个Activity中,您可以调用getIntent()(Activity的成员)来获取启动该Activity的Intent。在 onCreate() 中执行此操作。然后,它将返回一个 Intent 实例,您可以根据您打包的额外内容的类型来调用 getExtra() 。如果您的要求超出了支持的基本类型(已经实现 Parcelable 的事物和基本 java 类型),那么您将需要编写自己的类并实现 Parcelable 接口。

有关详细信息,请参阅 Intent 文档。

You need to call putExtra() on the Intent instance you are passing to startActivity(). In the second activity, you can call getIntent() (a member of Activity) to get the Intent that started the Activity. Do it in onCreate(). Then, it will return you an Intent instance, which you can call get<type>Extra() on depending on what type of extra you packed in there. If your requirements are beyond the basic types supported (things that already implement Parcelable, and the fundamental java types) then you will need to write your own class and implement the Parcelable interface.

See the Intent doc for more info.

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