java - Set image as wallpaper from url (Glide + json)

Question

app app

Hi, thanks in advance to those who guide me.

I have a problem with the Set Wallpaper, that when I clicked on the button, I get the following error:

2018-12-28 22: 36: 02.801 13030-13030 /? E / AndroidRuntime: FATAL EXCEPTION: main      java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress (android.graphics.Bitmap $ CompressFormat, int, java.io.OutputStream)' on a null object reference

I leave the files used.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:orientation="vertical"
    android:id="@+id/thumbnail2"
    android:padding="5dp">

    <TextView
        android:id="@+id/txtclose"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_gravity="end"
        android:layout_marginTop="5dp"
        android:layout_marginEnd="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginBottom="5dp"
        android:background="@drawable/circulo"
        android:gravity="center"
        android:text="@string/equis"
        android:textColor="@android:color/background_light"
        android:textStyle="bold" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:orientation="vertical">
<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="end">

        <Button
                android:id="@+id/btn"
                android:layout_width="159dp"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom|center"
                android:layout_marginBottom="25dp"
                android:background="@drawable/borde_redondo"
                android:text="Establecer como Fondo de Pantalla"
                android:textColor="#ffffff" />

</FrameLayout>
    </LinearLayout>
</LinearLayout>

public class infoanimales extends AppCompatActivity {

        private RequestOptions options;
        TextView txtclose;
        LinearLayout img;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_infoanimales);

            Button button = findViewById(R.id.btn);

            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    setWallpaper();
                }
            });

            if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            }

            this.options = new RequestOptions()
                    .diskCacheStrategy(DiskCacheStrategy.AUTOMATIC);

            String image_url = getIntent().getExtras().getString("img2");

            img = findViewById(R.id.thumbnail2);
            Glide.with(this).load(image_url).into(new SimpleTarget<Drawable>() {
                @Override
                public void onResourceReady(@NonNull Drawable fondoreceta, Transition<? super Drawable> transition) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                        img.setBackground(fondoreceta);
                    }
                }
            });

            TextView txtclose = findViewById(R.id.txtclose);
            txtclose.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    finish();
                }
            });
        }

        private void setWallpaper() {
            Bitmap bitmap = BitmapFactory.decodeFile("img2");
            WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());

            try {
                manager.setBitmap(bitmap);
                Toast.makeText(this, "Listo", Toast.LENGTH_SHORT).show();

            } catch (IOException e) {
                Toast.makeText(this, "error", Toast.LENGTH_SHORT).show();
            }
        }

    }

With this function, it works perfect, but that is having the images in the drawable folder, and what you want or what it is that you take the image of the json url, traide with glide

private void setWallpaper() {
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.cochinito);
        WallpaperManager manager = WallpaperManager.getInstance(getApplicationContext());

        try {
            manager.setBitmap(bitmap);
            Toast.makeText(this, "Listo", Toast.LENGTH_SHORT).show();

        } catch (IOException e) {
            Toast.makeText(this, "error", Toast.LENGTH_SHORT).show();
        }
    }

In conclusion, what I need is that when you click on the button, the displayed image is set as wallpaper

标签： javaandroidsetandroid-glidewallpaper

Answer 1

如我所见，您没有使用完整路径来解码位图。您需要获取完整的路径名，例如：

String uri =  Environment.getExternalStorageDirectory().toString() + "/" + PHOTO_DIR  + "/test.jpg";

在那之后：

Bitmap bitmap = BitmapFactory.decodeFile(uri);

参考