ZXing实现二维码功能

先布局

<Button
    android:text="生成"
    android:id="@+id/btn1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<Button
    android:text="扫描"
    android:id="@+id/btn2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
<ImageView

    android:id="@+id/img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

private String arr[] ={
        "android.permission.CAMERA",
        "android.permission.FLASHLIGHT",
        "android.hardware.camera",
        "android.hardware.camera.autofocus",
        "android.permission.VIBRATE",
        "android.permission.WAKE_LOCK",
        "android.permission.READ_EXTERNAL_STORAGE",
        "android.permission.WRITE_EXTERNAL_STORAGE",
        "android.permission.INTERNET"
};
private ImageView img;
private int code = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    right();
    setContentView(R.layout.activity_main);
    img = findViewById(R.id.img);
    findViewById(R.id.btn1).setOnClickListener(this);
    findViewById(R.id.btn2).setOnClickListener(this);
}

private void right() {
    if(Build.VERSION.SDK_INT >= 23){
        for(int i=0;i<arr.length;i++){
            if(ActivityCompat.checkSelfPermission(this,arr[i])!= PackageManager.PERMISSION_GRANTED){

                ActivityCompat.requestPermissions(this,arr,1);
            }
        }
    }
}

@Override
public void onClick(View view) {
    switch (view.getId()){
    	    //生成二维码
        case R.id.btn1:
            Bitmap codeBitmap = CodeUtils.createImage("砸瓦鲁多",200,200, BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));
            img.setImageBitmap(codeBitmap);
            break;
        //扫描二维码
        case R.id.btn2:
            Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
            startActivityForResult(intent,code);
            break;
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(code == requestCode){
        //扫描二维码
        String str = data.getStringExtra(CodeUtils.RESULT_STRING);
        Toast.makeText(this, "扫描结果:"+str, Toast.LENGTH_SHORT).show();
    }
}

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        ZXingLibrary.initDisplayOpinion(this);
//        if(LeakCanary.isInAnalyzerProcess(this)){
//            return;
//        }
//        LeakCanary.install(this);
    }
}