Android（十七）Intent的使用

Posted 2020-06-26

一、显示意图

1、跳转页面，只带过去数据，不返回数据。

Intent intent=new Intent(this,SecondActivity.class);
          intent.putExtra("String", "字符串");
          intent.putExtra("int", 250);
          intent.putExtra("img", BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
          startActivity(intent);

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2、返回多个数据。

 1、例如跳转A、B界面

public void goa(View v) {
        Intent intent = new Intent(this, A.class);
        startActivityForResult(intent, 3);
    }

    public void gob(View v) {
        Intent intent = new Intent(this, B.class);
        startActivityForResult(intent, 4);
    }

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2、AB界面代码。其中setResult(1, intent);后面必须加finish();resultCode的参数暂时不起作用

Intent intent=new Intent(A.this,MainActivity.class);
                intent.putExtra("data", str[position]);
                setResult(1, intent);
                finish();

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3、主界面得到返回数据。int requestCode参数用于辨别哪个界面传来的。主要是主界面跳转时，所写的标记。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode==3){
            String text = data.getStringExtra("data");
            Toast.makeText(getApplicationContext(),text+"|"+requestCode, 0).show();
        }else if(requestCode==4){
            String text = data.getStringExtra("data");
            Toast.makeText(getApplicationContext(),text+"|"+requestCode, 0).show();
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

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二、隐式意图。没有明确的指定跳转的界面。

1.在配置文件中做如下操作。

代码：

Intent intent=new Intent();
          intent.setAction("com.itheima.xxx");
          intent.addCategory("android.intent.category.DEFAULT");
          intent.putExtra("String", "字符串");
          intent.putExtra("int", 250);
          intent.putExtra("img", BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
          startActivity(intent);

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附《Intent调用常见系统组件方法》

// 调用浏览器  
Uri webViewUri = Uri.parse("http://blog.csdn.net/zuolongsnail");  
Intent intent = new Intent(Intent.ACTION_VIEW, webViewUri);  
  
// 调用地图  
Uri mapUri = Uri.parse("geo:100,100");  
Intent intent = new Intent(Intent.ACTION_VIEW, mapUri);  
  
// 播放mp3  
Uri playUri = Uri.parse("file:///sdcard/test.mp3");  
Intent intent = new Intent(Intent.ACTION_VIEW, playUri);  
intent.setDataAndType(playUri, "audio/mp3");  
  
// 调用拨打电话  
Uri dialUri = Uri.parse("tel:10086");  
Intent intent = new Intent(Intent.ACTION_DIAL, dialUri);  
// 直接拨打电话，需要加上权限<uses-permission id="android.permission.CALL_PHONE" />  
Uri callUri = Uri.parse("tel:10086");  
Intent intent = new Intent(Intent.ACTION_CALL, callUri);  
  
// 调用发邮件（这里要事先配置好的系统Email，否则是调不出发邮件界面的）  
Uri emailUri = Uri.parse("mailto:[email protected]");  
Intent intent = new Intent(Intent.ACTION_SENDTO, emailUri);  
// 直接发邮件  
Intent intent = new Intent(Intent.ACTION_SEND);  
String[] tos = { "[email protected]" };  
String[] ccs = { "[email protected]" };  
intent.putExtra(Intent.EXTRA_EMAIL, tos);  
intent.putExtra(Intent.EXTRA_CC, ccs);  
intent.putExtra(Intent.EXTRA_TEXT, "the email text");  
intent.putExtra(Intent.EXTRA_SUBJECT, "subject");  
intent.setType("text/plain");  
Intent.createChooser(intent, "Choose Email Client");  
  
// 发短信  
Intent intent = new Intent(Intent.ACTION_VIEW);  
intent.putExtra("sms_body", "the sms text");  
intent.setType("vnd.android-dir/mms-sms");  
// 直接发短信  
Uri smsToUri = Uri.parse("smsto:10086");  
Intent intent = new Intent(Intent.ACTION_SENDTO, smsToUri);  
intent.putExtra("sms_body", "the sms text");  
// 发彩信  
Uri mmsUri = Uri.parse("content://media/external/images/media/23");  
Intent intent = new Intent(Intent.ACTION_SEND);  
intent.putExtra("sms_body", "the sms text");  
intent.putExtra(Intent.EXTRA_STREAM, mmsUri);  
intent.setType("image/png");  
  
// 卸载应用  
Uri uninstallUri = Uri.fromParts("package", "com.app.test", null);  
Intent intent = new Intent(Intent.ACTION_DELETE, uninstallUri);  
// 安装应用  
Intent intent = new Intent(Intent.ACTION_VIEW);  
intent.setDataAndType(Uri.fromFile(new File("/sdcard/test.apk"), "application/vnd.android.package-archive");  
  
// 在Android Market中查找应用  
Uri uri = Uri.parse("market://search?q=愤怒的小鸟");           
Intent intent = new Intent(Intent.ACTION_VIEW, uri); 

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