将 TextView 添加到 LinearLayout 不起作用

Question

我有一个滚动视图，它将逐行列出程序的状态（onCreate、onPause、onResume 等）。每次状态发生变化时，TextView 的内容都会被覆盖而不是换行。

我已经尝试了几种方法，但我真的不确定它有什么问题。

这是我的 java 代码::

int numc= 0;
int nums= 0;
int numr= 0;
int nump= 0;
int numst=0;
int numd= 0;

TextView numCreate;
TextView numStart;
TextView numResume;
TextView numPause;
TextView numStop;
TextView numDestroy;

TextView tCreate;
TextView tStart;
TextView tResume;
TextView tPause;
TextView tStop;
TextView tDestroy;

LinearLayout linear;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lifecycle);

    numc++;
    Log.d("STATE", "onCreate executed");
    displayCount();

    linear= findViewById(R.id.linearLay);
    TextView t1= new TextView(this);
    t1.setText("onCreate executed");
    linear.addView(t1);
}

@Override
public void onResume() {
    super.onResume();
    setContentView(R.layout.activity_lifecycle);

    numr++;
    Log.d("STATE", "onRes executed" + numr);
    displayCount();

    linear=findViewById(R.id.linearLay);
    TextView t2= new TextView(this);
    linear.addView(t2);
    t2.setText("onResume executed");
}    
@Override
public void onPause() {
    super.onPause();
    setContentView(R.layout.activity_lifecycle);

    nump++;
    Log.d("STATE", "onPause executed" + nump);
    displayCount();

    linear=findViewById(R.id.linearLay);
    TextView t3= new TextView(this);
    linear.addView(t3);
    t3.setText("onPause executed");
    Log.d("INCREMENT", String.valueOf(linear.getChildCount()));
}

Answer 1

试试这个

从 onResume() onPause()

中删除 setContentView(R.layout.activity_lifecycle);

示例代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lifecycle);

    numc++;
    Log.d("STATE", "onCreate executed");
    displayCount();


    TextView t1= new TextView(this);
    t1.setText("onCreate executed");
    linear.addView(t1);
}

@Override
public void onResume() {
    super.onResume();


    numr++;
    Log.d("STATE", "onRes executed" + numr);
    displayCount();


    TextView t2= new TextView(this);
    linear.addView(t2);
    t2.setText("onResume executed");
}    
@Override
public void onPause() {
    super.onPause();


    nump++;
    Log.d("STATE", "onPause executed" + nump);
    displayCount();


    TextView t3= new TextView(this);
    linear.addView(t3);
    t3.setText("onPause executed");
    Log.d("INCREMENT", String.valueOf(linear.getChildCount()));

}

Answer 2

您应该从 onResume() 和 onPause() 中删除 setContentView(R.layout.activity_lifecycle);。

Answer 3

为 TextView 设置文本时，请使用 "\n，例如 t1.setText("onCreate executed"+ "\n");

Answer 4

去掉暂停事件中的setContentView，你可以在LinearLayout中添加这样的Textview

TextView htext =new TextView(this);
 textView.setText("Any Text");
 textView.setId(123);
 textView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));

然后

 linearlayout.addView(textView);

将 TextView 添加到 LinearLayout 不起作用

Adding TextView to LinearLayout not working

java

android

textview

android-linearlayout