onPre
doInbackGroup
onpost
private static final int CORE_POOL_SIZE = 5; //核心线程数
private static final int MAXIMUM_POOL_SIZE = 128; //最大线程数
private static final int KEEP_ALIVE = 1; //超时时间,当线程数超过核心线程数时,超过这个时间的空线程就会被销毁,直到线程数等于核心线程
实际开发我们会去继承Asynctask
//1.
public static interface OnCheckedChangeListener {
void onCheckedChanged(CompoundButton buttonView, boolean isChecked);
}
//2.
private OnCheckedChangeListener mOnCheckedChangeListener;
//3.
mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
//4.
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
actionBar版本兼容库.我们可以在2.1以下也是用actionbar
actionBar = getSupportActionBar();//得到actionbar,
actionBar.setDisplayHomeAsUpEnabled(true);//是否显示返回箭头,默认情况是false,
//如果setDisplayShowHomeEnabled setDisplayShowTitleEnabled 都是false,那么退回图标设置为true/false都不见
actionBar.setDisplayShowHomeEnabled(false);//是否显示logo,默认是true
actionBar.setDisplayShowTitleEnabled(true);//是否显示title,默认是true
// actionBar.setTitle("56期");//修改title
// actionBar.setIcon(R.drawable.icon_download);//修改logo
使用zxing包,qrcode
以前很长一段时间.关于zxing包的精简是比较火.
图片横着切
仿微信扫描效果
先找到按钮,然后调用
//1.启动扫描界面
Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
// 2.处理扫描结果
/**
*
* @param result
* @param barcode
*/
public void handleDecode(Result result, Bitmap barcode) {
inactivityTimer.onActivity();
playBeepSoundAndVibrate();
// 扫描结果
String resultString = result.getText();
if (resultString.equals("")) {
Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();
} else {
//2.传递扫描结果
Intent resultIntent = new Intent();
Bundle bundle = new Bundle();
bundle.putString("result", resultString);
bundle.putParcelable("bitmap", barcode);
resultIntent.putExtras(bundle);
this.setResult(RESULT_OK, resultIntent);
}
CaptureActivity.this.finish();
}
//3.收到回传的 结果
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case SCANNIN_GREQUEST_CODE:
if (resultCode == RESULT_OK) {
Bundle bundle = data.getExtras();
//显示扫描到的内容
tv_result.setText(bundle.getString("result"));
//显示
iv_qrcode.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
}
break;
}
}
多渠道打包可以用友盟工具、ant、gradle