我正在尝试将Android设备中的图像加载到我的应用程序中。
我已经在我的代码中使用了执行时间的权限,因为我发现它在最近的Api中是必要的,但它的工作方式不同。
我可以单击按钮并选择图像,但它不会出现在我的ImageView中。
这是我的ActivityCode:
package geoapp.testemapas.com.geoapp;
import android.app.VoiceInteractor;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import java.io.IOException;
public class PegarImagemActivity extends AppCompatActivity {
public static final int IMAGEM_ID = 1;
public static final int PERMISSAO_REQUEST = 2;
private Button pegarImgemBotaoPegarImagem;
private Button PegarImgemBotaoEnviarImagem;
private ImageView pegarImagemImageViewImgem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pegar_imagem);
pegarImgemBotaoPegarImagem = (Button) findViewById(R.id.pegar_imagem_botao_pegar_imagem);
pegarImagemImageViewImgem = (ImageView) findViewById(R.id.pegar_imagem_iv);
pegarImgemBotaoPegarImagem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, IMAGEM_ID);
}
});
if(ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
if(ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)){
}else{
ActivityCompat.requestPermissions(this, new String[] {android.Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSAO_REQUEST );
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent){
if(requestCode == IMAGEM_ID){
if(requestCode == RESULT_OK){
Uri imagem_selecionada = intent.getData();
String[] colunas = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(imagem_selecionada, colunas, null, null, null);
cursor.moveToFirst();
int index = cursor.getColumnIndex(colunas[0]);
String pathImg = cursor.getString(index);
cursor.close();
Bitmap bitmap = BitmapFactory.decodeFile(pathImg);
pegarImagemImageViewImgem.setImageBitmap(bitmap);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == PERMISSAO_REQUEST){
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
}else{
}
return;
}
}
}
答案 0 :(得分:0)
你可以尝试这种方法。
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"),
1001);
在活动结果中,您将获得所选图像,并可在图像视图中显示
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == 1001) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
bitmap = BitmapFactory.decodeFile(picturePath);
if (bitmap != null) {
ImageView img = (ImageView)findViewById(R.id.imgeview_id);
img.setImageBitmap(bitmap);
}
}
}
答案 1 :(得分:0)
看起来不错!需要进行一些修正才能使其适合您。
在Manifest文件中添加使用权限。
正确的代码错误。
if(resultCode == RESULT_OK){
}
那就是:)