Activity之间的跳转和数据传输

1.显式跳转

protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_a);
        bt1= (Button) findViewById(R.id.btn_jumptoB);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
//                显式
                Intent intent=new Intent(AActivity.this,BActivity.class);
//                Intent intent=new Intent();
                intent.setAction("sankuai.com");
                Bundle bundle=new Bundle();
                bundle.putString("name","lijing");
                intent.putExtras(bundle);
                startActivityForResult(intent,10086);
            }
        });

    }

2.隐式跳转

protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_a);
        bt1= (Button) findViewById(R.id.btn_jumptoB);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
//                显式
//                Intent intent=new Intent(AActivity.this,BActivity.class);
//                隐式
                Intent intent=new Intent();
                intent.setAction("sankuai.com");
                Bundle bundle=new Bundle();
                bundle.putString("name","lijing");
                intent.putExtras(bundle);
                startActivityForResult(intent,10086);
            }
        });
    }

Manifest文件中针对目标activity

<activity android:name=".jump.BActivity"
    android:label="B">
    <intent-filter>
        <action android:name="sankuai.com" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

3.把数据传递到目标activity
发：

protected void onCreate(@Nullable Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_a);
    bt1= (Button) findViewById(R.id.btn_jumptoB);
    bt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent=new Intent(AActivity.this,BActivity.class);
            Bundle bundle=new Bundle();
            bundle.putString("name","lijing");
            intent.putExtras(bundle);
            startActivityForResult(intent,10086);
        }
    });

}

收：

在目标activityz中
String name=getIntent().getStringExtra("name");

4.返回数据给上一个活动

public void onClick(View view) {
    Intent intent=new Intent(AActivity.this,BActivity.class);
    Bundle bundle=new Bundle();
    bundle.putString("name","lijing");
    intent.putExtras(bundle);
    startActivityForResult(intent,10086);--10086是requestcode
}
在目标activity中

buttonxx.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent=new Intent();
        intent.putExtra("visitor","999999");
        setResult(RESULT_OK,intent);--RESULT_OK是resultcode

　　　　finish();

    }
});

在BActivity被finish()销毁以后，AActivity会调用

onActivityResult方法，所以需要重写这个方法来接收来自B的传递数据

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode){
        case 10086:
            if (resultCode==RESULT_OK){
                String result=data.getStringExtra("visitor");
                Log.d("visitor",result);
            }
            break;
    }

总结：

startActivity只能传递给目标activity数据

startActivityForResult：既能传递数据，也能从另一个activity中回调数据给自己，如果两种都需要，可以直接使用

startActivityForResult。