android trainning(4)

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一、使用剪贴板在activity间传递信息

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);    }}

接受信息的activity

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());    }}

二、在Edittext之类的控件中进行图文混排

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    }

三、在activity的切换间设置动画

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    }}

四、获知是否有类接收广播

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());        }    }

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