二维码扫描

1. 在Module的build.gradle添加依赖

compile 'com.github.open-android:Zxing:v1.0.3'

2.清单文件添加权限

<uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-feature android:name="android.hardware.camera" /><uses-feature android:name="android.hardware.camera.autofocus" /><uses-permission android:name="android.permission.VIBRATE" /><uses-permission android:name="android.permission.FLASHLIGHT" />
<EditText    android:id="@+id/et"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="输入内容，生成二维码"    android:text="http://baidu.com" /><Button    android:id="@+id/btn2"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="生成二维码" /><Button    android:id="@+id/btn1"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="扫码（支持识别相册二维码）" /><ImageView    android:id="@+id/image"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_gravity="center_horizontal" /><TextView    android:id="@+id/tv_result"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_marginTop="30dp"    android:gravity="center"    android:text="扫描返回bitmap"    android:textColor="#FF0000"    android:textSize="18sp" /><ImageView    android:id="@+id/image_callback"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_gravity="center_horizontal"    android:layout_marginTop="10dp" />
import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import com.google.zxing.WriterException;import com.google.zxing.activity.CaptureActivity;import com.google.zxing.common.BitmapUtils;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button mBtn1;    private EditText mEt;    private Button mBtn2;    private ImageView mImage;    private final static int REQ_CODE = 1028;    private Context mContext;    private TextView mTvResult;    private ImageView mImageCallback;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        mContext = this;    }    private void initView() {        mBtn1 = (Button) findViewById(R.id.btn1);        mBtn1.setOnClickListener(this);        mEt = (EditText) findViewById(R.id.et);        mBtn2 = (Button) findViewById(R.id.btn2);        mBtn2.setOnClickListener(this);        mImage = (ImageView) findViewById(R.id.image);        mImage.setOnClickListener(this);        mTvResult = (TextView) findViewById(R.id.tv_result);        mTvResult.setOnClickListener(this);        mImageCallback = (ImageView) findViewById(R.id.image_callback);        mImageCallback.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.btn1://                startActivity(new Intent(MainActivity.this, CaptureActivity.class));                Intent intent = new Intent(mContext, CaptureActivity.class);                startActivityForResult(intent, REQ_CODE);                break;            case R.id.btn2:                mImage.setVisibility(View.VISIBLE);                //隐藏扫码结果view                mImageCallback.setVisibility(View.GONE);                mTvResult.setVisibility(View.GONE);                String content = mEt.getText().toString().trim();                Bitmap bitmap = null;                try {                    bitmap = BitmapUtils.create2DCode(content);//根据内容生成二维码                    mTvResult.setVisibility(View.GONE);                    mImage.setImageBitmap(bitmap);                } catch (WriterException e) {                    e.printStackTrace();                }                break;        }    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (requestCode == REQ_CODE) {            mImage.setVisibility(View.GONE);            mTvResult.setVisibility(View.VISIBLE);            mImageCallback.setVisibility(View.VISIBLE);            String result = data.getStringExtra(CaptureActivity.SCAN_QRCODE_RESULT);            Bitmap bitmap = data.getParcelableExtra(CaptureActivity.SCAN_QRCODE_BITMAP);            mTvResult.setText("扫码结果："+result);            showToast("扫码结果：" + result);            if(bitmap != null){                mImageCallback.setImageBitmap(bitmap);//现实扫码图片            }        }    }    private void showToast(String msg) {        Toast.makeText(mContext, "" + msg, Toast.LENGTH_SHORT).show();    }    @Override    public void onPointerCaptureChanged(boolean hasCapture) {    }}