android选择图片代码怎么写,Android 手写手机图片选择器

效果图

photo.png

需求： 获取手机内存中的所有图片，以及拍照图片。

首页布局RecyclerView，就不上布局代码了。

直接上整体首页代码

public class PhotoListActivity extends AppCompatActivity implements View.OnClickListener {

private RecyclerView recycManager;

private LoaderManager.LoaderCallbacks loaderCallbacks;//图片加载器

private Activity mActivity = null;

private ArrayList photoInfoList = new ArrayList<>();

private PhotoAdapter photoAdapter;

private File path;

private TextView textNumber;

private TextView textEnter;

private ArrayList resultList = new ArrayList<>();//返回首页的集合

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_photo_list);

initView();

initListener();

initPhoto();

initRecycler();

}

private void initView() {

mActivity = this;

recycManager = (RecyclerView) findViewById(R.id.recycManager);

textNumber = (TextView) findViewById(R.id.textNumber);

textEnter = (TextView) findViewById(R.id.textEnter);

textNumber.setText("(" + 0 + "/9" + ")");

}

private void initListener() {

textEnter.setOnClickListener(this);

}

private File createCreamePath;

private void initRecycler() {

GridLayoutManager gridLayoutManager = new GridLayoutManager(mActivity, 3);

recycManager.setLayoutManager(gridLayoutManager);

photoAdapter = new PhotoAdapter(mActivity, photoInfoList);

recycManager.setAdapter(photoAdapter);

photoAdapter.getPhoto(new PhotoAdapter.getPhoto() {

@Override

public void getTakeCreame(View v) {

Intent intentPhone = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

createCreamePath = createTmpFile(mActivity, "/Edreamoon/Pictures");

intentPhone.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(createCreamePath));

intentPhone.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);

startActivityForResult(intentPhone, 100);

}

});

photoAdapter.getSelectPhoto(new PhotoAdapter.getSelectPhoto() {

@Override

public void getListPhoto(List photoPath) {

resultList.clear();

int size = photoPath.size();

textNumber.setText("(" + size + "/9" + ")");

if (size > 0) {

textEnter.setVisibility(View.VISIBLE);

} else {

textEnter.setVisibility(View.GONE);

}

//获取选择集合赋值给 返回MAIN集合

for (String path : photoPath) {

if (resultList.contains(path)) {

resultList.remove(path);

} else {

resultList.add(path);

}

}

}

});

}

private void initPhoto() {

loaderCallbacks = new LoaderManager.LoaderCallbacks() {

private final String[] IMAGE_PROJECT = {

MediaStore.Images.Media.DATA,

MediaStore.Images.Media.DISPLAY_NAME,

MediaStore.Images.Media.DATE_ADDED,

MediaStore.Images.Media._ID,

MediaStore.Images.Media.SIZE,

};

@Override

public Loader onCreateLoader(int id, Bundle args) {

if (id == 0) {

return new CursorLoader(mActivity, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_PROJECT, null, null, IMAGE_PROJECT[2] + " DESC");

} else if (id == 1) {

return new CursorLoader(mActivity, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_PROJECT, IMAGE_PROJECT[0] + "like '%" + args.getString("path") + "%'", null, IMAGE_PROJECT[2] + " DESC");

}

return null;

}

@Override

public void onLoadFinished(Loader loader, Cursor data) {

if (data != null) {

photoInfoList.clear();

int count = data.getCount();

data.moveToFirst();

if (count > 0) {

do {

String path = data.getString(data.getColumnIndexOrThrow(IMAGE_PROJECT[0]));

String name = data.getString(data.getColumnIndexOrThrow(IMAGE_PROJECT[1]));

long time = data.getLong(data.getColumnIndexOrThrow(IMAGE_PROJECT[2]));

int size = data.getInt(data.getColumnIndexOrThrow(IMAGE_PROJECT[4]));

PhotoInfo photoInfo = new PhotoInfo(path, name, time, false);

Boolean isSize5k = size > 1024 * 5;

if (isSize5k) {

photoInfoList.add(photoInfo);

}

} while (data.moveToNext());

}

}

}

@Override

public void onLoaderReset(Loader loader) {

}

};

getSupportLoaderManager().restartLoader(0, null, loaderCallbacks);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if (requestCode == 100 && resultCode == RESULT_OK) {

resultList.clear();

String absolutePath = createCreamePath.getAbsolutePath();

resultList.add(absolutePath);

Intent intent = new Intent(mActivity, MainActivity.class);

intent.putExtra("resultPath", resultList);

setResult(200, intent);

finish();

}

}

/**

* 创建文件

*

* @param context context

* @param filePath 文件路径

* @return file

*/

public static File createTmpFile(Context context, String filePath) {

String timeStamp = new SimpleDateFormat("yyyyMMddHHmmss", Locale.CHINA).format(new Date());

String externalStorageState = Environment.getExternalStorageState();

File dir = new File(Environment.getExternalStorageDirectory() + filePath);

if (externalStorageState.equals(Environment.MEDIA_MOUNTED)) {

if (!dir.exists()) {

dir.mkdirs();

}

return new File(dir, timeStamp + ".jpg");

} else {

File cacheDir = context.getCacheDir();

return new File(cacheDir, timeStamp + ".jpg");

}

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.textEnter:

Intent intent = new Intent(mActivity, MainActivity.class);

intent.putExtra("resultPath", resultList);

setResult(200, intent);

finish();

break;

}

}

}

adapter代码

public class PhotoAdapter extends RecyclerView.Adapter {

private Context mContext;

private List list;

private LayoutInflater inflater;

private getPhoto getPhoto;

private List selectPhoto = new ArrayList<>();

private getSelectPhoto getSelectPhoto;

public PhotoAdapter(Context mContext, List list) {

this.mContext = mContext;

this.list = list;

inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

selectPhoto.clear();

}

public void getPhoto(getPhoto getPhoto) {

this.getPhoto = getPhoto;

}

public void getSelectPhoto(getSelectPhoto getSelectPhoto) {

this.getSelectPhoto = getSelectPhoto;

}

@Override

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

if (viewType == 0) {//显示的第一张图片的布局 ， 就是调用摄像头拍照的布局。

return new MyViewHolder(inflater.inflate(R.layout.item_photo_adapter_first, parent, false));

}//之后的图片显示的布局。

return new MyViewHolder(inflater.inflate(R.layout.item_photo_adapter, parent, false));

}

@Override

public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

holder.setIsRecyclable(false);

ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();

params.height = getScreenWidth(mContext) / 3;

params.width = getScreenWidth(mContext) / 3;

holder.itemView.setLayoutParams(params);//重设item大小

if (getItemViewType(position) == 0) {

holder.itemView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//因为拍照要返回参数，所以接口回调方式将事件处理交给activity处理

getPhoto.getTakeCreame(v);

}

});

return;

}

final MyViewHolder myViewHolder = (MyViewHolder) holder;

final PhotoInfo photoInfo = list.get(position - 1);

Glide.with(mContext).load(photoInfo.path).into(myViewHolder.image);

myViewHolder.image.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

if (selectPhoto.size() < 9) {

//selectPhoto为选中的集合。

if (selectPhoto.contains(photoInfo.path)) {

selectPhoto.remove(photoInfo.path);

photoInfo.setChecked(false);

myViewHolder.checkBox.setButtonDrawable(R.mipmap.uncheck);

} else {

selectPhoto.add(photoInfo.path);

photoInfo.setChecked(true);

myViewHolder.checkBox.setButtonDrawable(R.mipmap.checked);

}

myViewHolder.checkBox.setChecked(photoInfo.getChecked());

getSelectPhoto.getListPhoto(selectPhoto);

} else {

if (selectPhoto.contains(photoInfo.path)) {

selectPhoto.remove(photoInfo.path);

photoInfo.setChecked(false);

myViewHolder.checkBox.setButtonDrawable(R.mipmap.uncheck);

} else {

Toast.makeText(mContext, "最多选择9张", Toast.LENGTH_SHORT).show();

}

}

}

});

if (photoInfo.getChecked()) {

myViewHolder.checkBox.setChecked(photoInfo.getChecked());

myViewHolder.checkBox.setButtonDrawable(R.mipmap.checked);

} else {

myViewHolder.checkBox.setButtonDrawable(R.mipmap.uncheck);

}

}

@Override

public int getItemViewType(int position) {

if (position == 0) {

return 0;

}

return 1;

}

@Override

public int getItemCount() {

return list.size();

}

class MyViewHolder extends RecyclerView.ViewHolder {

private ImageView image;

private CheckBox checkBox;

public MyViewHolder(View itemView) {

super(itemView);

image = (ImageView) itemView.findViewById(R.id.image);

checkBox = (CheckBox) itemView.findViewById(R.id.checkbox);

}

}

/**

* 获得屏幕高度

*

* @param context context

* @return 屏幕高度

*/

public int getScreenWidth(Context context) {

WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics outMetrics = new DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

return outMetrics.widthPixels;

}

//获取拍照后的照片

public interface getPhoto {

void getTakeCreame(View v);

}

public interface getSelectPhoto {

void getListPhoto(List photoPath);

}

}

模型类

public class PhotoInfo {

public String name; // 图片名

public String path; // 图片路径

public long time; // 图片添加时间

public Boolean checked; //checkbox 选中状态

public PhotoInfo(String path, String name, long time ,Boolean checked) {

this.path = path;

this.name = name;

this.time = time;

this.checked =checked;

}

public Boolean getChecked() {

return checked;

}

public void setChecked(Boolean checked) {

this.checked = checked;

}

@Override

public String toString() {

return "PhotoInfo{" +

"name='" + name + '\'' +

", path='" + path + '\'' +

", time=" + time +

'}';

}

@Override

public boolean equals(Object object) {

try {

PhotoInfo other = (PhotoInfo) object;

return this.path.equalsIgnoreCase(other.path);

} catch (ClassCastException e) {

e.printStackTrace();

}

return super.equals(object);

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPath() {

return path;

}

public void setPath(String path) {

this.path = path;

}

public long getTime() {

return time;

}

public void setTime(long time) {

this.time = time;

}

}

具体思路

1-写一个模型类储存自己想要的数据： 路径，文件名，时间

2-涉及到recyclerView复用套checkbox的问题，所以在模型类中加了Boolean类型显示checkbox状态

3-通过LoaderManager.LoaderCallbacks 获取内存图片

4-书写adapter ：由于调用本地拍照需返回，所以adapter写接口，讲事件处理交给activity

5-加部分细节，比如只能只能9张 ，等。

6-activityResult回调处理，我将路径全都存到了集合中，可直接拿来路径上传服务器等或别的操作