activity 的跳转

在app文件夹上右键新建空的activity ，名称为DisplayMessageActivity，

修改layout文件夹下activity_display_message.xml

<?xml version="1.0" encoding="utf-8"?>
<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:id="@+id/ttv1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="edit_message"
        android:textColor="#5500FF"
        android:textSize="32sp"
        android:padding="10dp"
        />

    <TextView
        android:id="@+id/ttv2"
        android:layout_width="355dp"
        android:layout_height="wrap_content"
        android:maxLines="1"
        android:ellipsize="end"
        android:padding="10dp"
        android:text="what are you going to do"
        android:textColor="#00FF55"
        android:textSize="32sp"
        />

    <TextView
        android:id="@+id/ttv3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="More Info"
        android:textSize="32sp"
        android:padding="10dp"
        />

</LinearLayout>

修改activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnTextView1"
        android:layout_width="223dp"
        android:layout_height="69dp"
        android:text="TestTextView" />

</LinearLayout>

修改MainActivity.java

package com.example.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {

    private Button mBtnTextView;  // define a text view button
    @Override
    protected void onCreate(Bundle x) {
        super.onCreate(x);
        setContentView(R.layout.activity_main);
        mBtnTextView = findViewById(R.id.btnTextView1);  // get the button, it is in activity_main.xml
        mBtnTextView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, DisplayMessageActivity.class);
                startActivity(intent);
            }
        });
    };
}

修改DisplayMessageActivity.java

package com.example.myapplication;

import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class DisplayMessageActivity extends AppCompatActivity {

    private TextView mtv1;
    @Override
    protected void onCreate(Bundle x) {
        super.onCreate(x);
        setContentView(R.layout.activity_display_message);
        mtv1 = findViewById(R.id.ttv1);
        mtv1.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG); // set strike through style
        mtv1.getPaint().setAntiAlias(true); // get rid of the zigzag effect
    }
}

修改AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".DisplayMessageActivity"
            android:parentActivityName=".MainActivity" >
            <!-- The meta-data tag is required if you support API level 15 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

点击运行！

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