android trainning(4)

public class MainActivity extends Activity {
    EditText text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text=(EditText)findViewById(R.id.edit_text);
    }
    public void start_activity(View view){
        Intent intent=new Intent(this,RetainFragment.class);
        ClipboardManager clipboard=(ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);//使用剪贴板传递信息
        clipboard.setText("hello world!");
        startActivity(intent);
    }
}

public class RetainFragment extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView textView=new TextView(this);
        setContentView(textView);
        ClipboardManager clipboard=(ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
        textView.setText(clipboard.getText().toString());
    }
}

public void insert_image(View view){
        Random random=new Random();
        int pos=random.nextInt(2);
        Bitmap bitmap;
        if(pos==1)
            bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.a1);
        else
            bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.a2);
        ImageSpan imageSpan=new ImageSpan(this,bitmap);
        SpannableString spannableString=new SpannableString("face");
        spannableString.setSpan(imageSpan,0,4,SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
        text.append(spannableString);//注意
    }

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void start_activity1(View view){
        Intent intent=new Intent(this,Activity2.class);
        startActivity(intent);
        overridePendingTransition(R.anim.in_anim,R.anim.out_anim);//第一个参数指定将要打开的activity的进入动画，后者指定当前activity的退出动画
    }
}

public void start_activity1(View view){
        PackageManager manager=getPackageManager();
        Intent intent=new Intent("android.broadcast");
        List<ResolveInfo> resolveInfos=manager.queryBroadcastReceivers(intent,PackageManager.GET_INTENT_FILTERS);//使用这个类下的方法可以查询到别的信息
        StringBuilder str=new StringBuilder();//例如正在运行的服务等等
        for(ResolveInfo info:resolveInfos){
            str.append(info.toString());
        }
    }