android项目调用微信8.0扫一扫

 按钮点击事件
Button btn_pay = (Button) findViewById(R.id.btn_pay);
btn_pay.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        //调用微信扫一扫
        Intent intent = new Intent();
        intent.setComponent(new ComponentName("com.tencent.mm", "com.tencent.mm.ui.LauncherUI"));
        intent.putExtra("LauncherUI.From.Scaner.Shortcut", true);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction("android.intent.action.VIEW");
        startActivity(intent);

    }
});