Android calls the camera to take pictures (only take a second sheet is automatically replaced)

These two days I played Android Wanji Tian did not move, his mind springing a note, would like to take pictures with the camera Android call (photographed), and then survive, the Internet Baidu, a lot of people say, I tried 7.0 the following very easy on the successful, because if not dynamic at 7.0 application for permission to apply for permission dynamic I did not write, I manually open permissions, so it means a waste, interested look at it.

First rejection layout file code:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.paizhao.MainActivity">

    <Button
        android:id="@+id/take_photo"
        android: text = "camera"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteY="0dp"
        tools:layout_editor_absoluteX="8dp" />

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        tools:layout_editor_absoluteY="0dp"
        tools:layout_editor_absoluteX="0dp" />
</android.support.constraint.ConstraintLayout>

　　Layout code so it can copy itself, does not matter.

Then initialize MainActivity:

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
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.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private Button btn; // camera button
    private Uri ImageUri; // store pictures Address
    private ImageView picture; // display the picture with ImageView
    public static final int TAKE_PHOTO=1;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.take_photo);//加上ID
        picture = (ImageView) findViewById(R.id.picture);
    }
}

　　Then there is the more disgusting place

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File outputImage = new File(getExternalCacheDir(), "outputImage.jpg");
                try {
                    if (outputImage.exists()) {
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace ();
                }
                if (Build.VERSION.SDK_INT> = 24) {// judge this place Android version is greater than 7.0, if it is greater than 24, then his version is greater than 7.0
                    ImageUri = FileProvider.getUriForFile (MainActivity.this, "com.example.paizhao.FileProvider", outputImage); // show transition operation, using FileProvider transformation, a file transfer type content type into
　　　　　　　　　　　　// Android 7.0 system after the ban applied to the external public file: // URI, so we have to transition.
　　　　　　　　　　　　// FileProvider is a subclass of ContentProvider, private transfer files between applications for use prior to registration AndroidManifest

　　　　　　　　　　} else {
                    Of the geUri = Do it .fromFile (of tpu Image);
                    System.out.println(ImageUri);
                }
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT, ImageUri);
                startActivityForResult(intent, TAKE_PHOTO);
            }
        });

display image:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode){
            case TAKE_PHOTO:
                if (resultCode==RESULT_OK){
                    try {
                        // A picture is taken is displayed
                        Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(ImageUri));
                        picture.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace ();
                    }
                }
                break;
            default:
                break;
        }
    }

Then is 7.0 or more unique things in the registration FileProvider AndroidManifest.

<provider
            android:name="android.support.v4.content.FileProvider"
            android: authorities = "com.example.paizhao.FileProvider" // prevent some students directly copy the code and consequently will not fall collapse, authorities are your package name + FileProvider, FileProvider.getUriForFile above the second argument and it you must be exactly equal.
            android: exported = "false" // like the rest of the direct copy
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

　　Add the phrase: Also in AndroidManifest, seemingly use the following 7.0

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <! - call camera permissions ->
    <uses-permission android:name="android.permission.CAMERA" />

　　Well, go try it.