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Activity页面跳转

  • 很高兴和大家再次见面，我是lady_zhou，这是我的Blog，欢迎大家一起来学习Activity页面跳转

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

1.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;
    @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()));
                Log.d("one",mEditText1.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>

2.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。