Activity页面跳转

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Activity页面跳转

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Activity页面跳转有两种方式：

无返回结果的页面跳转
有返回结果的页面跳转

无返回结果的页面跳转

主要代码实现:

     Intent intent = new Intent(上下文,你将要跳的Activity.class);     startActivity(intent);

大致情况就是：

 Intent intent = new Intent(MainActivity.this, NewActivity.class); startActivity(intent);

这里是从MainActivity调到NewActivity

有返回结果的页面跳转

主要代码实现:
从第一个Activity跳到第二个Activity

在第一个Activity中：

    Intent intent = new Intent(上下文,你将要跳的Activity.class);    startActivityForResult(intent, requestCode);

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);   }

在第二个Activity中

    setResult(resultCode,intent);

这里的参数分别代表：

requestCode：请求的标志
resultCode：第二个页面返回的标志
data：回传的数据

下面举两个例子，让我们再来熟悉一下具体操作

这里是在第一个界面中输入两个数相乘，在第二个界面中显示结果

MainActivity:

private Button mButton;private EditText mEditText1, mEditText2;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    mButton = (Button) findViewById(R.id.button);    mEditText1 = (EditText) findViewById(R.id.edit1);    mEditText2 = (EditText) findViewById(R.id.edit2);    mButton.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Intent intent = new Intent(MainActivity.this,NewActivity.class);            Bundle bundle = new Bundle();            bundle.putDouble("key1",Double.valueOf(mEditText1.getText().toString()));            bundle.putDouble("key2",Double.valueOf(mEditText2.getText().toString()));            intent.putExtras(bundle);            startActivity(intent);        }    }); }}

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"> <LinearLayout    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    android:layout_gravity="center"    ><EditText    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/edit1"    android:textSize="40dp"    /><TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="乘以"    android:textSize="40dp"    /><EditText    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/edit2"    android:textSize="40dp"    />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:id="@+id/text1"        android:text="="        android:textSize="40dp"        />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:id="@+id/text2"        android:textSize="40dp"        /></LinearLayout><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/button"    android:text="等于"    android:layout_gravity="center"    android:textSize="40dp"    /></LinearLayout>

NewActivity：

public class NewActivity extends Activity {    private TextView mTextView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_new);        mTextView = (TextView) findViewById(R.id.text);        Bundle bundle = getIntent().getExtras();        Double mEditText1 = bundle.getDouble("key1");        Double mEditText2 = bundle.getDouble("key2");        Double three = mEditText1 * mEditText2;        mTextView.setText("结果：" + String.valueOf(three));       }     }

activity_new.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/text"        android:textSize="40dp"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/button"        android:text="返回"        android:layout_gravity="center"        /></LinearLayout>

这里是在第一个界面中输入两个数相乘，在第二个界面中显示结果，并把结果返回到第一个界面中

NewActivity：

public class NewActivity extends Activity {    private TextView mTextView;    private Button mButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_new);        mTextView = (TextView) findViewById(R.id.text);        mButton = (Button) findViewById(R.id.button);        Bundle bundle = getIntent().getExtras();        Double mEditText1 = bundle.getDouble("key1");        Double mEditText2 = bundle.getDouble("key2");        final Double three = mEditText1 * mEditText2;        mTextView.setText("结果：" + String.valueOf(three));         mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent();                intent.putExtra("data",Double.valueOf(three));                setResult(2,intent);                finish();            }        });       }     }

MainActivity:

     private Button mButton;    private EditText mEditText1, mEditText2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mEditText1 = (EditText) findViewById(R.id.edit1);        mEditText2 = (EditText) findViewById(R.id.edit2);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {            Intent intent = new Intent(MainActivity.this, NewActivity.class);                Bundle bundle = new Bundle();                bundle.putDouble("key1",Double.valueOf(mEditText1.getText().toString()));                bundle.putDouble("key2",Double.valueOf(mEditText2.getText().toString()));                intent.putExtras(bundle);               startActivityForResult(intent, 1);            }        });     }      @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (requestCode == 1 && resultCode == 2) {            Double result = data.getDoubleExtra("data",2);            mTextView.setText(String.valueOf(result));        }    }    }

XML文件都是相同的，这样就能够实现两个界面的跳转了。

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