simplezxing

移除了zxing android demo里不需要的功能，保留了相机的预览和二维码以及条形码的识别

使用方法： public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button startBtn=findViewById(R.id.startBtn);
    startBtn.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            Intent intent=new Intent(MainActivity.this, CaptureActivity.class);
            startActivityForResult(intent,1001);

        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode==1001 && resultCode== Activity.RESULT_OK)
    {
        String result=data.getStringExtra(CaptureActivity.KEY_DATA);
        Toast.makeText(this, "qrcode result is "+result, Toast.LENGTH_SHORT).show();
    }
}

}