android开发学习——day5

  活动跳转部分代码显式intent

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);
        Button button1=(Button)findViewById(R.id.button_1);
        button1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                //Toast.makeText(FirstActivity.this,"You clicked Button 1",
                       // Toast.LENGTH_SHORT).show();
                Intent intent=new Intent(FirstActivity.this,SecondActivity.class);
                startActivity(intent);
            }
        });
    }

  隐式intent跳转，设置category

public void onClick(View v){
                //Toast.makeText(FirstActivity.this,"You clicked Button 1",
                       // Toast.LENGTH_SHORT).show();
                Intent intent=new Intent("com.example.hs769.activitytest.ACTION_START");
                intent.addCategory("com.example.hs769.activitytest.MY_CATEGORY");
                startActivity(intent);
            }

<intent-filter>
                <action android:name="com.example.hs769.activitytest.ACTION_START"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <category android:name="com.example.hs769.activitytest.MY_CATEGORY"/>
            </intent-filter>

  开浏览器

<activity android:name=".ThirdActivity">
            <intent-filter>
                <action android:name="android.intent.action.VIEW"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <data android:scheme="http"/>
            </intent-filter>
        </activity>

public void onClick(View v){
                //Toast.makeText(FirstActivity.this,"You clicked Button 1",
                       // Toast.LENGTH_SHORT).show();
                Intent intent=new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse("http://www.baidu.com"));
                //intent.addCategory("com.example.hs769.activitytest.MY_CATEGORY");
                startActivity(intent);
            }

  利用intent向活动传参，正向

public void onClick(View v){
                String data="Hello SecondActivity";
                Intent intent=new Intent(FirstActivity.this,SecondActivity.class);
                intent.putExtra("extra_data",data);
                startActivity(intent);
            }

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_layout);
        Intent intent=getIntent();