Question

我试图创建一个显示每个图像文本的应用程序，我已经导入了四个图像和四个文本视图，但是当我按下任何一个图像时，它会显示相同的文本。并在同一时间显示4个文本

如何在每张图片上显示不同的文字。（我在Main2Activity工作）

xml代码

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="WELCOME "
    android:id="@+id/t1"
    android:textSize="50dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="49dp"
    android:checked="true"/>


<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="ANDROID"
    android:id="@+id/t3"
    android:textSize="50dp"
    android:layout_above="@+id/t4"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="45dp"
    android:checked="false"/>
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="STUDIO"
    android:id="@+id/t4"
    android:textSize="50dp"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="91dp"
    android:checked="false"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="TO"
    android:id="@+id/t2"
    android:layout_below="@+id/t1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="47dp"
    android:textSize="50dp"
    android:checked="false"/>

JAVA CODE

public class Main2Activity extends Activity实现View.OnClickListener { TextView t1，t2，t3，t4，textview;

@Override
public void onCreate (Bundle savedInstanceState, PersistableBundle persistentState) {
    super.onCreate (savedInstanceState, persistentState);
    setContentView(R.layout.activity_main);
    t1 = (TextView) findViewById (R.id.text);
    t1.setOnClickListener (this); //here you're setting onClickListener to listen for taps
    textview = (TextView) findViewById (R.id.t1);
    t2.setOnClickListener (this);
    textview = (TextView) findViewById (R.id.t2);
    t3.setOnClickListener (this);
    textview = (TextView) findViewById (R.id.t3);
    t4.setOnClickListener (this);
    textview = (TextView) findViewById (R.id.t4);
}

@Override
public void onClick (View v) { //this is an implementation of OnClickListener interface
    switch (v.getId ()){ //here you're reading id of the taped button and doing something depending on what TextView taped
        case R.id.t1:
            t1.setText ("leo");
            break;
       case R.id.t2:
           t2.setText ("mike");
            break;
        case R.id.t3:
            t3.setText ("raph");
            break;
        case R.id.t4:
            t4.setText ("don");
            break;
    }}}

Answer 1

您需要在声明TextView的活动中实现View.OnClickListener。代码应该看起来像这样

@Override
public void onCreate (Bundle savedInstanceState, PersistableBundle persistentState) {
    super.onCreate (savedInstanceState, persistentState);
    setContentView(R.layout.activity_main);
    t1 = (TextView) findViewById (R.id.t1);
    t1.setOnClickListener (this); 

    t2 = (TextView) findViewById (R.id.t2);
    t2.setOnClickListener (this);

    t3 = (TextView) findViewById (R.id.t3);
    t3.setOnClickListener (this);

    t4 = (TextView) findViewById (R.id.t4);
    t1.setOnClickListener (this);
}

@Override
public void onClick (View v) { //this is an implementation of OnClickListener interface
    switch (v.getId ()){ //here you're reading id of the taped button and doing something depending on what TextView taped
        case R.id.t1:
            t1.setText ("leo");
            break;
       case R.id.t2:
           t2.setText ("mike");
            break;
        case R.id.t3:
            t3.setText ("raph");
            break;
        case R.id.t4:
            t4.setText ("don");
            break;
    }}}

如果你有多个TextView，那么你需要每个都有.setOnClickListener（this）

如何在android studio中链接图像和文本？

1 个答案: